{"id":3370,"date":"2017-11-05T22:56:46","date_gmt":"2017-11-05T22:56:46","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=3370"},"modified":"2024-06-30T00:36:27","modified_gmt":"2024-06-30T00:36:27","slug":"vestibulares-recentes-ondulatoria-2017-2016-2015","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/vestibulares-recentes\/ondulatoria\/vestibulares-recentes-ondulatoria-2017-2016-2015\/","title":{"rendered":"Vestibulares Recentes \u2013 Ondulat\u00f3ria \u2013 2017 \u2013 2016 – 2015"},"content":{"rendered":"

Vestibulares Recentes \u2013 Ondulat\u00f3ria \u2013 2017 \u2013 2016 – 2015<\/span><\/span><\/span><\/p>\n

ONDAS – Conceitos e defini\u00e7\u00f5es<\/span><\/span><\/span><\/p>\n

01-(UNESP-SP-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Radares s\u00e3o emissores e receptores de ondas de r\u00e1dio<\/b><\/span><\/span>\u00a0e t\u00eam\u00a0<\/b><\/span><\/span>aplica\u00e7\u00f5es, <\/b><\/span><\/span>por exemplo, na\u00a0<\/b><\/span><\/span>determina\u00e7\u00e3o de velocidades de ve\u00edculos nas ruas e rodovias.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

J\u00e1 os\u00a0<\/b><\/span><\/span>sonares s\u00e3o emissores e receptores de ondas sonoras,\u00a0<\/b><\/span><\/span>sendo utilizados\u00a0<\/b><\/span><\/span>no meio aqu\u00e1tico\u00a0<\/b><\/span><\/span>para\u00a0<\/b><\/span><\/span>determina\u00e7\u00e3o da profundidade dos oceanos, localiza\u00e7\u00e3o de cardumes, dentre outras aplica\u00e7\u00f5es.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Comparando-se as\u00a0<\/b><\/span><\/span>ondas emitidas pelos radares e pelos sonares,\u00a0<\/b><\/span><\/span>temos que:<\/b><\/span><\/span><\/span><\/span><\/p>\n

(A)\u00a0<\/b><\/span><\/span>as\u00a0<\/b><\/span><\/span>ondas<\/b><\/span><\/span>\u00a0emitidas pelos\u00a0<\/b><\/span><\/span>radares s\u00e3o mec\u00e2nicas\u00a0<\/b><\/span><\/span>e as\u00a0<\/b><\/span><\/span>ondas<\/b><\/span><\/span>\u00a0emitidas pelos\u00a0<\/b><\/span><\/span>sonares s\u00e3o eletromagn\u00e9ticas.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(B) ambas as ondas\u00a0<\/b><\/span><\/span>exigem um\u00a0<\/b><\/span><\/span>meio material para se propagarem\u00a0<\/b><\/span><\/span>e,<\/b><\/span><\/span>quanto mais denso for esse meio, menores ser\u00e3o suas velocidades de propaga\u00e7\u00e3o.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(C)\u00a0<\/b><\/span><\/span>as\u00a0<\/b><\/span><\/span>ondas de r\u00e1dio\u00a0<\/b><\/span><\/span>t\u00eam\u00a0<\/b><\/span><\/span>oscila\u00e7\u00f5es longitudinais\u00a0<\/b><\/span><\/span>e as\u00a0<\/b><\/span><\/span>ondas sonoras<\/b><\/span><\/span>t\u00eam\u00a0<\/b><\/span><\/span>oscila\u00e7\u00f5es transversais. (D)\u00a0<\/b><\/span><\/span>as\u00a0<\/b><\/span><\/span>frequ\u00eancias de oscila\u00e7\u00e3o\u00a0<\/b><\/span><\/span>de\u00a0<\/b><\/span><\/span>ambas as ondas n\u00e3o dependem do meio em que se propagam.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(E)\u00a0<\/b><\/span><\/span>a\u00a0<\/b><\/span><\/span>velocidade de propaga\u00e7\u00e3o das ondas dos radares<\/b><\/span><\/span>\u00a0pela atmosfera\u00a0<\/b><\/span><\/span>\u00e9 menor do que a velocidade de propaga\u00e7\u00e3o das ondas dos sonares\u00a0<\/b><\/span><\/span>pela \u00e1gua.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

02-(UERJ-RJ\/017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\u00a0<\/span>03-(Faculdade de Medicina do Hospital Israelita Albert Einstein)<\/b><\/span><\/span><\/span><\/p>\n

Quest\u00e3o dissertativa<\/b><\/span><\/span><\/span><\/p>\n

Imagem ultrassonogr\u00e1fica<\/b><\/span><\/span><\/span>\u00a0\u00e9 um m\u00e9todo de\u00a0<\/b><\/span><\/span><\/span>visualiza\u00e7\u00e3o da anatomia<\/b><\/span><\/span><\/span>, que mostra na\u00a0<\/b><\/span><\/span><\/span>tela do monit<\/b><\/span><\/span><\/span>or os\u00a0<\/b><\/span><\/span><\/span>reflexos das ondas sonoras de alta frequ\u00eancia.<\/b><\/span><\/span><\/span><\/p>\n

As\u00a0<\/b><\/span><\/span><\/span>imagens<\/b><\/span><\/span><\/span>\u00a0de\u00a0<\/b><\/span><\/span><\/span>ultrassom de diagn\u00f3stico\u00a0<\/b><\/span><\/span><\/span>s\u00e3o obtidas com um\u00a0<\/b><\/span><\/span><\/span>risco m\u00ednimo para o paciente,\u00a0<\/b><\/span><\/span><\/span>especialmente quando\u00a0<\/b><\/span><\/span><\/span>comparadas com outras t\u00e9cnicas de imagem.<\/b><\/span><\/span><\/span>\"\"<\/p>\n

Uma\u00a0<\/b><\/span><\/span><\/span>imagem ultrassonogr\u00e1fica<\/b><\/span><\/span><\/span>\u00a0\u00e9 composta de um <\/b><\/span><\/span><\/span>grande n\u00famero de linhas informativas de eco\u00a0<\/b><\/span><\/span><\/span>que s\u00e3o\u00a0<\/b><\/span><\/span><\/span>geradas uma a uma em r\u00e1pida sucess\u00e3o.<\/b><\/span><\/span><\/span><\/p>\n

Um\u00a0<\/b><\/span><\/span><\/span>pulso de energia ultrassonogr\u00e1fica\u00a0<\/b><\/span><\/span><\/span>\u00e9 transmitido no corpo\u00a0<\/b><\/span><\/span><\/span>ao longo do eixo de cada linha do transdutor.<\/b><\/span><\/span><\/span><\/p>\n

Os\u00a0<\/b><\/span><\/span><\/span>ecos<\/b><\/span><\/span><\/span>\u00a0s\u00e3o\u00a0<\/b><\/span><\/span><\/span>criados<\/b><\/span><\/span><\/span>\u00a0quando a\u00a0<\/b><\/span><\/span><\/span>onda encontra um tecido de diferente imped\u00e2ncia ac\u00fastica.<\/b><\/span><\/span><\/span><\/p>\n

O ultrassom\u00a0<\/b><\/span><\/span><\/span>vai do\u00a0<\/b><\/span><\/span><\/span>transdutor at\u00e9 o alvo e ent\u00e3o o eco retorna ao transdutor novamente.<\/b><\/span><\/span><\/span><\/p>\n

O\u00a0<\/b><\/span><\/span><\/span>eco\u00a0<\/b><\/span><\/span><\/span>tamb\u00e9m tem sua\u00a0<\/b><\/span><\/span><\/span>frequ\u00eancia alterada<\/b><\/span><\/span><\/span>; medindo as\u00a0<\/b><\/span><\/span><\/span>diferen\u00e7as entre as frequ\u00eancias<\/b><\/span><\/span><\/span>\u00a0da\u00a0<\/b><\/span><\/span><\/span>transmiss\u00e3o do pulso e do eco<\/b><\/span><\/span><\/span>, pode-se\u00a0<\/b><\/span><\/span><\/span>determinar a velocidade do sangue<\/b><\/span><\/span><\/span>, por exemplo, entre outras informa\u00e7\u00f5es. O\u00a0<\/b><\/span><\/span><\/span>tempo entre a transmiss\u00e3o inicial do pulso e o recebimento do eco<\/b><\/span><\/span><\/span>\u00a0pelo transdutor \u00e9 de\u00a0<\/b><\/span><\/span><\/span>aproximadamente 13 microssegundos\u00a0<\/b><\/span><\/span><\/span>para o\u00a0<\/b><\/span><\/span><\/span>som percorrer um alvo que tem 1cm de profundidade.<\/b><\/span><\/span><\/span><\/p>\n

Os\u00a0<\/b><\/span><\/span><\/span>algoritmos de medi\u00e7\u00e3o\u00a0<\/b><\/span><\/span><\/span>e processamento de\u00a0<\/b><\/span><\/span><\/span>imagens de ultrassom de diagn\u00f3stico\u00a0<\/b><\/span><\/span><\/span>assumem que a\u00a0<\/b><\/span><\/span><\/span>velocidade do som no tecido corporal \u00e9 praticamente constante.<\/b><\/span><\/span><\/span><\/p>\n

Tipos\u00a0<\/b><\/span><\/span><\/span>diferentes de tecido corporal t\u00eam diferentes velocidades do som.<\/b><\/span><\/span><\/span><\/p>\n

No\u00a0<\/b><\/span><\/span><\/span>tecido mol<\/b><\/span><\/span><\/span>e h\u00e1 um\u00a0<\/b><\/span><\/span><\/span>erro<\/b><\/span><\/span><\/span>\u00a0de\u00a0<\/b><\/span><\/span><\/span>aproximadamente 2%<\/b><\/span><\/span><\/span>; este pode ser\u00a0<\/b><\/span><\/span><\/span>de at\u00e9 5<\/b><\/span><\/span><\/span>%, especialmente se\u00a0<\/b><\/span><\/span><\/span>houver tecido gorduroso na \u00e1rea da imagem que est\u00e1 sendo medida<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

O\u00a0<\/b><\/span><\/span><\/span>aparelho mostrado na figura segue padr\u00f5es mod<\/b><\/span><\/span><\/span>ernos e, como tal,<\/b><\/span><\/span><\/span>apresenta mais de uma fun\u00e7\u00e3o,\u00a0<\/b><\/span><\/span><\/span>pois, al\u00e9m de\u00a0<\/b><\/span><\/span><\/span>trabalhar com ultrassonografia,\u00a0<\/b><\/span><\/span><\/span>tamb\u00e9m permite\u00a0<\/b><\/span><\/span><\/span>calcular a Frequ\u00eancia Card\u00edaca (FC)\u00a0<\/b><\/span><\/span><\/span>em um\u00a0<\/b><\/span><\/span><\/span>eletrocardiograma (ECG),\u00a0<\/b><\/span><\/span><\/span>o que \u00e9 de\u00a0<\/b><\/span><\/span><\/span>grande import\u00e2ncia diagn\u00f3stica.<\/b><\/span><\/span><\/span><\/p>\n

Determinar uma\u00a0<\/b><\/span><\/span><\/span>taquicardia ou uma bradicardia\u00a0<\/b><\/span><\/span><\/span>pode trazer\u00a0<\/b><\/span><\/span><\/span>suspeitas sobre certas patologias\u00a0<\/b><\/span><\/span><\/span>e sua\u00a0<\/b><\/span><\/span><\/span>gravidade.<\/b><\/span><\/span><\/span>\"\"<\/p>\n

A maneira\u00a0<\/b><\/span><\/span><\/span>mais f\u00e1cil de calcular a FC\u00a0<\/b><\/span><\/span><\/span>\u00e9 observar o\u00a0<\/b><\/span><\/span><\/span>valor da an\u00e1lise autom\u00e1tica do ECG.<\/b><\/span><\/span><\/span><\/p>\n

As ondas de um\u00a0<\/b><\/span><\/span><\/span>eletrocardiograma normal\u00a0<\/b><\/span><\/span><\/span>s\u00e3o denominadas\u00a0<\/b><\/span><\/span><\/span>P, Q, R, S, T <\/b><\/span><\/span><\/span>nessa ordem e s\u00e3o\u00a0<\/b><\/span><\/span><\/span>ligadas<\/b><\/span><\/span><\/span>\u00a0entre si por\u00a0<\/b><\/span><\/span><\/span>uma linha isoel\u00e9trica<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

O papel de\u00a0<\/b><\/span><\/span><\/span>ECG<\/b><\/span><\/span><\/span>\u00a0\u00e9 um\u00a0<\/b><\/span><\/span><\/span>papel milimetrado,\u00a0<\/b><\/span><\/span><\/span>onde cada\u00a0<\/b><\/span><\/span><\/span>quadrado pequeno mede 1mm<\/b><\/span><\/span><\/span>.<\/b><\/span><\/span><\/span><\/p>\n

Cada\u00a0<\/b><\/span><\/span><\/span>5 quadrados pequenos s\u00e3o demarcados por uma linha mais grossa que define um quadrado grande de 5 mm.<\/b><\/span><\/span><\/span><\/p>\n

O\u00a0<\/b><\/span><\/span><\/span>eixo vertical\u00a0<\/b><\/span><\/span><\/span>mede a\u00a0<\/b><\/span><\/span><\/span>amplitude da corrente el\u00e9trica\u00a0<\/b><\/span><\/span><\/span>e como\u00a0<\/b><\/span><\/span><\/span>regra geral, 10 mm de altura\u00a0<\/b><\/span><\/span><\/span>\u00e9\u00a0<\/b><\/span><\/span><\/span>igual a 1mV.<\/b><\/span><\/span><\/span><\/p>\n

O\u00a0<\/b><\/span><\/span><\/span>eixo horizontal mede o tempo<\/b><\/span><\/span><\/span>. Em um\u00a0<\/b><\/span><\/span><\/span>ECG padr\u00e3o<\/b><\/span><\/span><\/span>, o papel tem uma <\/b><\/span><\/span><\/span>velocidade de 25 mm\/s,\u00a0<\/b><\/span><\/span><\/span>portanto\u00a0<\/b><\/span><\/span><\/span>1 mm horizontal equivale a 0,04 s<\/b><\/span><\/span><\/span>\u00a0e um <\/b><\/span><\/span><\/span>quadrado grande \u00e9 equivalente a 0,20 s.<\/b><\/span><\/span><\/span><\/p>\n

Em um\u00a0<\/b><\/span><\/span><\/span>ECG normal,\u00a0<\/b><\/span><\/span><\/span>em\u00a0<\/b><\/span><\/span><\/span>cada segundo,\u00a0<\/b><\/span><\/span><\/span>existem\u00a0<\/b><\/span><\/span><\/span>cinco quadrados grandes<\/b><\/span><\/span><\/span>, e em\u00a0<\/b><\/span><\/span><\/span>um minuto, 300 quadrados grandes,\u00a0<\/b><\/span><\/span><\/span>o que\u00a0<\/b><\/span><\/span><\/span>torna esse n\u00famero, 300, um n\u00famero m\u00e1gico para a Frequ\u00eancia Card\u00edaca.<\/b><\/span><\/span><\/span><\/p>\n

Conforme a\u00a0<\/b><\/span><\/span><\/span>figura ao lado, <\/b><\/span><\/span><\/span>considere que, de\u00a0<\/b><\/span><\/span><\/span>uma onda R (batimento zero) at\u00e9 a pr\u00f3xima onda R (batimento 1),\u00a0<\/b><\/span><\/span><\/span>o\u00a0<\/b><\/span><\/span><\/span>ECG\u00a0<\/b><\/span><\/span><\/span>\u00e9 de uma pessoa com\u00a0<\/b><\/span><\/span><\/span>FC de aproximadamente 65 bpm.<\/b><\/span><\/span><\/span>\"\"<\/p>\n

a)\u00a0<\/b><\/span><\/span><\/span>Determine,\u00a0<\/b><\/span><\/span><\/span>em cm,\u00a0<\/b><\/span><\/span><\/span>a <\/b><\/span><\/span><\/span>profundidade m\u00e1xima aproximada <\/b><\/span><\/span><\/span>obtida por\u00a0<\/b><\/span><\/span><\/span>um pulso ultrass\u00f4nico\u00a0<\/b><\/span><\/span><\/span>em um\u00a0<\/b><\/span><\/span><\/span>tecido (alvo), cujo tempo desde sua emiss\u00e3o at\u00e9 o retorno de seu eco ao transdutor seja igual a 130\u03bcs.<\/b><\/span><\/span><\/span><\/p>\n

b)\u00a0<\/b><\/span><\/span><\/span>Calcule a\u00a0<\/b><\/span><\/span><\/span>Frequ\u00eancia Card\u00edaca (FC)<\/b><\/span><\/span><\/span>\u00a0de um\u00a0<\/b><\/span><\/span><\/span>paciente cujo ECG est\u00e1 indicado abaixo.<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

04-(FATEC \u2013 SP \u2013 16\/17)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

O texto cita o termo\u00a0<\/b><\/span><\/span>radia\u00e7\u00e3o<\/b><\/span><\/span>\u00a0nos trechos: \u201cradia\u00e7\u00e3o, que engloba os raios c\u00f3smicos gal\u00e1cticos e solares\u201d e \u201cabsor\u00e7\u00e3o de 330 milisierverts de radia\u00e7\u00e3o no organismo\u201d. O texto n\u00e3o est\u00e1 fazendo alus\u00e3o \u00e0s\u00a0<\/b><\/span><\/span>emiss\u00f5es de part\u00edculas<\/b><\/span><\/span>, mas sim\u00a0<\/b><\/span><\/span>\u00e0s ondas eletromagn\u00e9ticas<\/b><\/span><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\u00c9\u00a0<\/b><\/span><\/span>correto afirmar\u00a0<\/b><\/span><\/span>que essas ondas<\/b><\/span><\/span><\/span><\/span><\/p>\n

(A) propagam-se,\u00a0<\/b><\/span><\/span>independentemente do meio<\/b><\/span><\/span>, de maneira\u00a0<\/b><\/span><\/span>transversal<\/b><\/span><\/span>quanto ao modo de vibra\u00e7\u00e3o.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(B) propagam-se,\u00a0<\/b><\/span><\/span>dependendo do meio<\/b><\/span><\/span>, de maneira\u00a0<\/b><\/span><\/span>longitudinal<\/b><\/span><\/span>\u00a0quanto ao modo de vibra\u00e7\u00e3o.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(C) possuem\u00a0<\/b><\/span><\/span>velocidade<\/b><\/span><\/span>\u00a0de propaga\u00e7\u00e3o\u00a0<\/b><\/span><\/span>menor<\/b><\/span><\/span>\u00a0que a\u00a0<\/b><\/span><\/span>velocidade do som no ar<\/b><\/span><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(D) est\u00e3o diretamente\u00a0<\/b><\/span><\/span>relacionadas ao Planeta Vermelho<\/b><\/span><\/span>,\u00a0<\/b><\/span><\/span>emissor constante\u00a0<\/b><\/span><\/span>de radia\u00e7\u00e3o danosa.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(E) t\u00eam os espectros luminosos, nas\u00a0<\/b><\/span><\/span>faixas ultravioleta e infravermelha<\/b><\/span><\/span>, como \u00fanicos\u00a0<\/b><\/span><\/span>respons\u00e1veis<\/b><\/span><\/span>\u00a0por essa radia\u00e7\u00e3o.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

05-(ENEM-MEC-016)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A\u00a0<\/b><\/span><\/span>Figura 1<\/b><\/span><\/span>\u00a0apresenta o\u00a0<\/b><\/span><\/span>gr\u00e1fico da intensidade, em decib\u00e9is (dB),<\/b><\/span><\/span>\u00a0da\u00a0<\/b><\/span><\/span>onda sonora emitida<\/b><\/span><\/span>\u00a0por um\u00a0<\/b><\/span><\/span>alto-falante, <\/b><\/span><\/span>que\u00a0<\/b><\/span><\/span>est\u00e1 em repouso,<\/b><\/span><\/span>\u00a0e\u00a0<\/b><\/span><\/span>medida por um micro fone<\/b><\/span><\/span>\u00a0em\u00a0<\/b><\/span><\/span>fun\u00e7\u00e3o da frequ\u00eancia da onda<\/b><\/span><\/span>\u00a0para\u00a0<\/b><\/span><\/span>diferentes dist\u00e2ncias: 3 mm, 25 mm, 51 mm e 60 mm.<\/b><\/span><\/span><\/span><\/span><\/p>\n

A\u00a0<\/b><\/span><\/span>Figura 2<\/b><\/span><\/span>\u00a0apresenta um\u00a0<\/b><\/span><\/span>diagrama com a indica\u00e7\u00e3o das diversas faixas do espectro de frequ\u00eancia sonora para o modelo de alto-falante utilizado neste experimento.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Relacionando<\/b><\/span><\/span>\u00a0as\u00a0<\/b><\/span><\/span>informa\u00e7\u00f5es presentes nas figuras 1 e 2,<\/b><\/span><\/span>\u00a0como a <\/b><\/span><\/span>intensidade sonora percebida \u00e9 afetada pelo aumento da dist\u00e2ncia do microfone ao alto-falante?<\/b><\/span><\/span><\/span><\/span><\/p>\n

a)Aumenta\u00a0<\/b><\/span><\/span>na\u00a0<\/b><\/span><\/span>faixa das frequ\u00eancias m\u00e9dias.<\/b><\/span><\/span><\/span><\/span><\/p>\n

b)Diminui\u00a0<\/b><\/span><\/span>na\u00a0<\/b><\/span><\/span>faixa das frequ\u00eancias agudas.<\/b><\/span><\/span><\/span><\/span><\/p>\n

c)Diminui na faixa<\/b><\/span><\/span>\u00a0das\u00a0<\/b><\/span><\/span>frequ\u00eancias graves.<\/b><\/span><\/span><\/span><\/span><\/p>\n

d)Aumenta na faixa<\/b><\/span><\/span>\u00a0das\u00a0<\/b><\/span><\/span>frequ\u00eancias m\u00e9dias altas.<\/b><\/span><\/span><\/span><\/span><\/p>\n

e)Aumenta na faixa<\/b><\/span><\/span>\u00a0das\u00a0<\/b><\/span><\/span>frequ\u00eancias m\u00e9dias baixas.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\u00a0<\/span><\/p>\n

06-<\/b><\/span><\/span><\/span>(ENEM-MEC-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Para\u00a0<\/b><\/span><\/span>obter a posi\u00e7\u00e3o de um telefone celular<\/b><\/span><\/span>, a pol\u00edcia baseia-se em <\/b><\/span><\/span>informa\u00e7\u00f5es do tempo de resposta do aparelho em rela\u00e7\u00e3o \u00e0s torres de celular\u00a0<\/b><\/span><\/span>da regi\u00e3o de onde se\u00a0<\/b><\/span><\/span>originou a liga\u00e7\u00e3o.<\/b><\/span><\/span>\"\"<\/p>\n

Em\u00a0<\/b><\/span><\/span>uma regi\u00e3o, um aparelho est\u00e1 na \u00e1rea de cobertura de cinco torres, <\/b><\/span><\/span>conforme o esquema.<\/b><\/span><\/span><\/p>\n

Considerando que\u00a0<\/b><\/span><\/span>as torres e o celular s\u00e3o puntiformes\u00a0<\/b><\/span><\/span>e que est\u00e3o\u00a0<\/b><\/span><\/span>sob o mesmo plano, <\/b><\/span><\/span>qual o\u00a0<\/b><\/span><\/span>n\u00famero m\u00ednimo de torres necess\u00e1rias <\/b><\/span><\/span>para se\u00a0<\/b><\/span><\/span>localizar a posi\u00e7\u00e3o do telefone celular que originou a liga\u00e7\u00e3o?<\/b><\/span><\/span><\/p>\n

a)\u00a0<\/b><\/span><\/span>Uma<\/b><\/span><\/span><\/p>\n

b)\u00a0<\/b><\/span><\/span>Duas<\/b><\/span><\/span><\/p>\n

c)\u00a0<\/b><\/span><\/span>tr\u00eas<\/b><\/span><\/span><\/p>\n

d)\u00a0<\/b><\/span><\/span>Quatro<\/b><\/span><\/span><\/p>\n

e)\u00a0<\/b><\/span><\/span>Cinco<\/b><\/span><\/span><\/p>\n

 <\/p>\n

07-(FUVEST-SP-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A\u00a0<\/b><\/span><\/span>figura<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>representa<\/b><\/span><\/span>\u00a0uma\u00a0<\/b><\/span><\/span>onda harm\u00f4nica transversal,<\/b><\/span><\/span>\u00a0que se\u00a0<\/b><\/span><\/span>propaga no sentido positivo do eixo x,<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

em\u00a0<\/b><\/span><\/span>dois instantes de tempo: t = 3 s (linha cheia) e t = 7 s (linha tracejada).<\/b><\/span><\/span><\/span><\/span><\/p>\n

Dentre<\/b><\/span><\/span>\u00a0as\u00a0<\/b><\/span><\/span>alternativas, a que pode corresponder \u00e0 velocidade de propaga\u00e7\u00e3o dessa onda<\/b><\/span><\/span>\u00a0\u00e9<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Equa\u00e7\u00e3o da onda<\/span><\/span><\/span><\/p>\n

08-(EBMSP-BA-017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

09-(UNESP-SP-16)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

10-(UERJ-RJ\/017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Observe no\u00a0<\/b><\/span><\/span>diagrama\u00a0<\/b><\/span><\/span>o\u00a0<\/b><\/span><\/span>aspecto\u00a0<\/b><\/span><\/span>de\u00a0<\/b><\/span><\/span>uma onda\u00a0<\/b><\/span><\/span>que se\u00a0<\/b><\/span><\/span>propaga com velocidade de 0,48 m\/s\u00a0<\/b><\/span><\/span>em uma<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

corda:<\/b><\/span><\/span><\/p>\n

Calcule,<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>em hertz, a frequ\u00eancia\u00a0<\/b><\/span><\/span>da\u00a0<\/b><\/span><\/span>fonte geradora\u00a0<\/b><\/span><\/span>da onda.<\/b><\/span><\/span><\/p>\n

11-(MACKENZIE-SP-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

O\u00a0<\/b><\/span><\/span>gr\u00e1fico abaixo<\/b><\/span><\/span>\u00a0representa uma\u00a0<\/b><\/span><\/span>onda\u00a0<\/b><\/span><\/span>que se propaga com\u00a0<\/b><\/span><\/span>velocidade constante de 200 m\/s.<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

A\u00a0<\/b><\/span><\/span>amplitude (A), o comprimento de onda (\u03bb) e a frequ\u00eancia (f) da onda s\u00e3o,<\/b><\/span><\/span>respectivamente,<\/b><\/span><\/span><\/p>\n

a)<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>2,4 cm; 1,0 cm; 40 kHz<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span><\/p>\n

b)<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>2,4 cm; 4,0 cm; 20 kHz<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span><\/p>\n

c)<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>1,2 cm; 2,0cm; 40 kHz<\/b><\/span><\/span><\/p>\n

d)<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>1,2 cm; 2,0 cm; 10 kHz<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span><\/p>\n

e)<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>1,2 cm; 4,0 cm; 10 kHz<\/b><\/span><\/span><\/p>\n

12-(ENEM-MEC-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

Considere:<\/b><\/span><\/span><\/p>\n

velocidade da luz = 3,0 x 108\u00a0m\/s e 1 nm = 1,0 x 10\u20139\u00a0m.<\/b><\/span><\/span>\"\"<\/p>\n

O\u00a0<\/b><\/span><\/span>filtro solar que a pessoa deve selecionar<\/b><\/span><\/span>\u00a0\u00e9 o<\/b><\/span><\/span><\/p>\n

a)<\/b><\/span><\/span>\u00a0V<\/b><\/span><\/span><\/p>\n

b)<\/b><\/span><\/span>\u00a0IV<\/b><\/span><\/span><\/p>\n

c)<\/b><\/span><\/span>\u00a0III<\/b><\/span><\/span><\/p>\n

d)<\/b><\/span><\/span>\u00a0II<\/b><\/span><\/span><\/p>\n

e)<\/b><\/span><\/span>\u00a0I<\/b><\/span><\/span><\/p>\n

13-(MACKENZIE-SP-2017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

 <\/p>\n

Um\u00a0<\/b><\/span><\/span>pescador observa que seu barco oscila\u00a0<\/b><\/span><\/span>na<\/b><\/span><\/span>dire\u00e7\u00e3o vertical<\/b><\/span><\/span>, para\u00a0<\/b><\/span><\/span>baixo e para cima 200 vezes em 50 s.<\/b><\/span><\/span><\/span><\/span>\"\"<\/p>\n

O\u00a0<\/b><\/span><\/span>per\u00edodo de uma oscila\u00e7\u00e3o do barco\u00a0<\/b><\/span><\/span>\u00e9<\/b><\/span><\/span><\/span><\/span><\/p>\n

a)\u00a0<\/b><\/span><\/span>4,0 s<\/b><\/span><\/span><\/span><\/span><\/p>\n

b)\u00a0<\/b><\/span><\/span>2,0 s\u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

c)\u00a0<\/b><\/span><\/span>1,0 s\u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

d)\u00a0<\/b><\/span><\/span>0,50 s<\/b><\/span><\/span><\/span><\/span><\/p>\n

e)\u00a0<\/b><\/span><\/span>0,25 s<\/b><\/span><\/span><\/span><\/span><\/p>\n

 <\/p>\n

14-(FMJ-SP-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um equipamento de ultrassonografia n\u00e3o consegue distinguir duas superf\u00edcies refletoras das ondas ultrass\u00f4nicas se a dist\u00e2ncia entre elas for menor que o comprimento das ondas utilizadas. Sabendo que a velocidade de propaga\u00e7\u00e3o das ondas ultrass\u00f4nicas nos tecidos moles do corpo \u00e9 de 1540 m\/s, se um equipamento de ultrassonografia utiliza ondas com frequ\u00eancia de 2,0 MHz, ele consegue distinguir duas estruturas separadas de, no m\u00ednimo,<\/b><\/span><\/span><\/span><\/span><\/p>\n

(A) 1,30 mm.<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

(B) 0,13 mm.<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

(C) 3,08 mm.<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

(D) 0,77 mm.<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

(E) 0,95 mm.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Reflex\u00e3o e refra\u00e7\u00e3o de ondas<\/span><\/span><\/span><\/p>\n

 <\/p>\n

15-(COL\u00c9GIO NAVAL \u2013 2016\/17)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um\u00a0<\/b><\/span><\/span>certo submarino,\u00a0<\/b><\/span><\/span>atrav\u00e9s do seu\u00a0<\/b><\/span><\/span>sonar,\u00a0<\/b><\/span><\/span>emite\u00a0<\/b><\/span><\/span>ondas ultrass\u00f4nicas de frequ\u00eancia 28 kHz,\u00a0<\/b><\/span><\/span>cuja\u00a0<\/b><\/span><\/span>configura\u00e7\u00e3o \u00e9 apresentada na figura:<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Em uma\u00a0<\/b><\/span><\/span>miss\u00e3o, estando em repouso,\u00a0<\/b><\/span><\/span>esse submarino\u00a0<\/b><\/span><\/span>detectou um obst\u00e1culo a sua frente, medido pelo retorno do sinal do sonar 1,2 segundos ap\u00f3s ter sido emitido.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Para\u00a0<\/b><\/span><\/span>essa situa\u00e7\u00e3o,\u00a0<\/b><\/span><\/span>pode-se\u00a0<\/b><\/span><\/span>afirmar<\/b><\/span><\/span>\u00a0que a\u00a0<\/b><\/span><\/span>velocidade da onda sonora nessa \u00e1gua e a dist\u00e2ncia<\/b><\/span><\/span>\u00a0em\u00a0<\/b><\/span><\/span>que se encontra o obst\u00e1culo valem, <\/b><\/span><\/span>respectivamente:\u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

a)\u00a0<\/b><\/span><\/span>340 m\/s e 460 m .\u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

b)\u00a0<\/b><\/span><\/span>340 m\/ s e 680 m .\u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

c)\u00a0<\/b><\/span><\/span>340 m\/s e 840 m.\u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

d)\u00a0<\/b><\/span><\/span>1400 m\/s e 680 m.<\/b><\/span><\/span><\/span><\/span><\/p>\n

e)\u00a0<\/b><\/span><\/span>1400 m\/s e 840 m .<\/b><\/span><\/span><\/span><\/span><\/p>\n

16-(Medicina \u2013 USCS-SP-016)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Ao se\u00a0<\/b><\/span><\/span>submeter a um exame de resson\u00e2ncia magn\u00e9tica<\/b><\/span><\/span>\u00a0em sua\u00a0<\/b><\/span><\/span>cabe\u00e7a<\/b><\/span><\/span>, um paciente ouve\u00a0 <\/b><\/span><\/span>sons cuja<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

frequ\u00eancia o operador revela ser de 160 Hz<\/b><\/span><\/span>. Sabe-se que a\u00a0<\/b><\/span><\/span>velocidade do som nas condi\u00e7\u00f5es do exame \u00e9 de 330 m\/s<\/b><\/span><\/span>. Assim, \u00e9\u00a0<\/b><\/span><\/span>correto\u00a0<\/b><\/span><\/span>afirmar que o\u00a0<\/b><\/span><\/span>comprimento de onda das ondas sonoras causadoras desta sensa\u00e7\u00e3o ao paciente \u00e9 da ordem<\/b><\/span><\/span><\/p>\n

(A)<\/b><\/span><\/span>\u00a0do\u00a0<\/b><\/span><\/span>di\u00e2metro<\/b><\/span><\/span>\u00a0de um\u00a0<\/b><\/span><\/span>fio de cabelo.<\/b><\/span><\/span><\/p>\n

(B)<\/b><\/span><\/span>\u00a0da\u00a0<\/b><\/span><\/span>extens\u00e3o<\/b><\/span><\/span>\u00a0de um\u00a0<\/b><\/span><\/span>campo oficial de futebol.<\/b><\/span><\/span><\/p>\n

(C)<\/b><\/span><\/span>\u00a0da\u00a0<\/b><\/span><\/span>dist\u00e2ncia<\/b><\/span><\/span>\u00a0entre as cidades de\u00a0<\/b><\/span><\/span>S\u00e3o Paulo e Rio de Janeiro.<\/b><\/span><\/span><\/p>\n

(D)<\/b><\/span><\/span>\u00a0da\u00a0<\/b><\/span><\/span>largura\u00a0<\/b><\/span><\/span>de um\u00a0<\/b><\/span><\/span>autom\u00f3vel de passeio.<\/b><\/span><\/span><\/p>\n

(E)<\/b><\/span><\/span>\u00a0do\u00a0<\/b><\/span><\/span>di\u00e2metro<\/b><\/span><\/span>\u00a0de uma\u00a0<\/b><\/span><\/span>bola de t\u00eanis.<\/b><\/span><\/span><\/p>\n

 <\/p>\n

17-(Faculdade de Tecnologia Termomec\u00e2nica \u2013 SP- 017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Ondas sonoras propagam-se no ar a uma\u00a0<\/b><\/span><\/span>velocidade de 340 m\/s<\/b><\/span><\/span>. Ao encontrarem com a superf\u00edcie da \u00e1gua, adentram nesse novo meio e <\/b><\/span><\/span>passam a se deslocar com velocidade de 1360 m\/s<\/b><\/span><\/span>. Se, no ar, seu <\/b><\/span><\/span>comprimento de onda era de 34 m, na \u00e1gua ser\u00e1 de<\/b><\/span><\/span><\/span><\/span><\/p>\n

(A) 64 m.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(B) 82 m.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(C) 120 m.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(D) 136 m.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(E) 148 m.<\/b><\/span><\/span><\/span><\/span><\/p>\n

18-(UNESP-SP-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A figura representa\u00a0<\/b><\/span><\/span><\/span>ondas chegando a uma praia<\/b><\/span><\/span><\/span>. Observa-se que, \u00e0 <\/b><\/span><\/span><\/span>medida que se aproximam da areia, as cristas v\u00e3o mudando de dire\u00e7\u00e3o, <\/b><\/span><\/span><\/span>tendendo a ficar paralelas \u00e0 orla. Isso ocorre devido ao fato de que a <\/b><\/span><\/span><\/span>parte da onda que atinge a regi\u00e3o mais rasa do mar tem sua velocidade de propaga\u00e7\u00e3o diminu\u00edda,<\/b><\/span><\/span><\/span>\u00a0enquanto aparte que se\u00a0<\/b><\/span><\/span><\/span>propaga na regi\u00e3o mais profunda permanece com a mesma velocidade at\u00e9 alcan\u00e7ar a regi\u00e3o mais rasa,\u00a0<\/b><\/span><\/span><\/span>alinhando-se com a primeira parte.<\/b><\/span><\/span><\/span><\/p>\n

(www.if.ufrgs.br. Adaptado.)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

O que foi\u00a0<\/b><\/span><\/span>descrito no texto e na figura\u00a0<\/b><\/span><\/span>caracteriza um\u00a0<\/b><\/span><\/span>fen\u00f4meno ondulat\u00f3rio chamado<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

Interfer\u00eancia de ondas (ondas estacion\u00e1rias)<\/span><\/span><\/span><\/p>\n

 <\/p>\n

19-(UFAM-AM-2017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Num experimento realizado no laborat\u00f3rio de F\u00edsica, duas fontes pontuais<\/b><\/span><\/span>produzem, na\u00a0<\/b><\/span><\/span>superf\u00edcie<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

da \u00e1gua contida em um tanque de profundidade constante, ondas circulares de mesma amplitude<\/b><\/span><\/span>,\u00a0<\/b><\/span><\/span>mesma frequ\u00eancia e mesma fase.<\/b><\/span><\/span><\/p>\n

Podemos afirmar que as\u00a0<\/b><\/span><\/span>linhas nodais observadas na superf\u00edcie da \u00e1gua representam\u00a0<\/b><\/span><\/span>o\u00a0<\/b><\/span><\/span>lugar geom\u00e9trico dos pontos onde ocorre:<\/b><\/span><\/span><\/p>\n

a)\u00a0<\/b><\/span><\/span>reflex\u00e3o das ondas<\/b><\/span><\/span><\/p>\n

b)\u00a0<\/b><\/span><\/span>difra\u00e7\u00e3o das ondas<\/b><\/span><\/span><\/p>\n

c)\u00a0<\/b><\/span><\/span>dispers\u00e3o das ondas<\/b><\/span><\/span><\/p>\n

d)\u00a0<\/b><\/span><\/span>interfer\u00eancia destrutiva das ondas<\/b><\/span><\/span><\/p>\n

e)\u00a0<\/b><\/span><\/span>interfer\u00eancia construtiva das ondas<\/b><\/span><\/span><\/p>\n

 <\/p>\n

20-(FAMERP-SP-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Dois pulsos transversais, 1 e 2,\u00a0<\/b><\/span><\/span>propagam-se por uma\u00a0<\/b><\/span><\/span>mesma corda el\u00e1stica, em sentidos opostos, com velocidades\u00a0escalares constantes e iguais, de m\u00f3dulos 60 cm\/s.<\/b><\/span><\/span><\/span><\/span><\/p>\n

No instante t = 0,\u00a0<\/b><\/span><\/span>a corda apresenta-se com a\u00a0<\/b><\/span><\/span>configura\u00e7\u00e3o representada na figura 1.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Ap\u00f3s\u00a0<\/b><\/span><\/span>a\u00a0<\/b><\/span><\/span>superposi\u00e7\u00e3o desses dois pulsos<\/b><\/span><\/span>, a corda\u00a0<\/b><\/span><\/span>se apresentar\u00e1 com a configura\u00e7\u00e3o representada na figura 2.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Considerando a\u00a0<\/b><\/span><\/span>superposi\u00e7\u00e3o apenas desses dois pulsos,<\/b><\/span><\/span>\u00a0a\u00a0<\/b><\/span><\/span>configura\u00e7\u00e3o da corda\u00a0<\/b><\/span><\/span>ser\u00e1 a\u00a0<\/b><\/span><\/span>representada na figura 2, pela primeira vez,\u00a0<\/b><\/span><\/span>no instante<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

 <\/p>\n

21-(FDSBC-SP-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

 <\/p>\n

\u00a0<\/span><\/p>\n

22-(FGV-SP-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

As\u00a0<\/b><\/span><\/span>figuras a seguir\u00a0<\/b><\/span><\/span>representam\u00a0<\/b><\/span><\/span>uma foto<\/b><\/span><\/span>\u00a0e um\u00a0<\/b><\/span><\/span>esquema<\/b><\/span><\/span>\u00a0em\u00a0<\/b><\/span><\/span>que F1\u00a0e F2s\u00e3o fontes de frentes de ondas mec\u00e2nicas planas, coerentes e em fase, oscilando com a frequ\u00eancia de 4,0 Hz.<\/b><\/span><\/span><\/span><\/span>\"\"<\/p>\n

As\u00a0<\/b><\/span><\/span>ondas produzidas <\/b><\/span><\/span>propagam-se a uma <\/b><\/span><\/span>velocidade de 2,0 m\/s.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Sabe-se que\u00a0<\/b><\/span><\/span>D > 2,8 m e que P \u00e9 um ponto vibrante de m\u00e1xima amplitude.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Nessas condi\u00e7\u00f5es, o <\/b><\/span><\/span>menor valor de D\u00a0 <\/b><\/span><\/span>deve ser<\/b><\/span><\/span><\/span><\/span><\/p>\n

(A)\u00a0<\/b><\/span><\/span>2,9 m.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(B)\u00a0<\/b><\/span><\/span>3,0 m.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(C)\u00a0<\/b><\/span><\/span>3,1 m.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(D)\u00a0<\/b><\/span><\/span>3,2 m<\/b><\/span><\/span><\/span><\/span><\/p>\n

(E)\u00a0<\/b><\/span><\/span>3,3<\/b><\/span><\/span><\/span><\/span><\/p>\n

 <\/p>\n

 <\/p>\n

23-(ENEM-MEC-016)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um\u00a0<\/b><\/span><\/span>experimento\u00a0<\/b><\/span><\/span>para comprovar a\u00a0<\/b><\/span><\/span>natureza ondulat\u00f3ria da radia\u00e7\u00e3o de micro-ondas<\/b><\/span><\/span>\u00a0foi realizado da\u00a0<\/b><\/span><\/span>seguinte forma anotou-se a frequ\u00eancia de opera\u00e7\u00e3o<\/b><\/span><\/span>\u00a0de um\u00a0<\/b><\/span><\/span>forno de micro-ondas\u00a0<\/b><\/span><\/span>e, em seguida,\u00a0<\/b><\/span><\/span>retirou-se sua plataforma girat\u00f3ria.<\/b><\/span><\/span><\/span><\/span><\/p>\n

No seu lugar, colocou-se\u00a0<\/b><\/span><\/span>uma travessa refrat\u00e1ria com uma camada grossa de manteiga.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Depois disso<\/b><\/span><\/span>, o forno foi\u00a0<\/b><\/span><\/span>ligado por alguns segundos.<\/b><\/span><\/span>\u00a0Ao se retirar<\/b><\/span><\/span>\u00a0a travessa refrat\u00e1ria do forno, observou-se<\/b><\/span><\/span>\u00a0que havia\u00a0<\/b><\/span><\/span>tr\u00eas pontos de manteiga derretida alinhados sobre toda a travessa.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Parte da onda estacionaria\u00a0<\/b><\/span><\/span>gerada no interior<\/b><\/span><\/span>\u00a0do forno \u00e9\u00a0<\/b><\/span><\/span>ilustrada<\/b><\/span><\/span>\u00a0na figura.<\/b><\/span><\/span><\/span><\/span><\/p>\n

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De acordo com a\u00a0<\/b><\/span><\/span>figura,<\/b><\/span><\/span>\u00a0que\u00a0<\/b><\/span><\/span>posi\u00e7\u00f5es correspondem a dois pontos consecutivos da manteiga derretida?<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Resson\u00e2ncia<\/span><\/span><\/span><\/p>\n

24-(FAMERP-SP-015)<\/b><\/span><\/span><\/span><\/p>\n

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A\u00a0<\/b><\/span><\/span>figura\u00a0<\/b><\/span><\/span>mostra um\u00a0<\/b><\/span><\/span>diapas\u00e3o<\/b><\/span><\/span>, instrumento met\u00e1lico que, ao ser\u00a0<\/b><\/span><\/span>golpeado, emite ondas sonoras<\/b><\/span><\/span>\u00a0com\u00a0<\/b><\/span><\/span>frequ\u00eancia correspondente a determinada nota musical.<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

Quando se\u00a0<\/b><\/span><\/span>aproxima um diapas\u00e3o vibrando das cordas de um instrumento afinado<\/b><\/span><\/span>, a corda\u00a0<\/b><\/span><\/span>correspondente\u00a0<\/b><\/span><\/span>\u00e0 nota emitida pelo diapas\u00e3o<\/b><\/span><\/span>\u00a0passa a vibrar com a<\/b><\/span><\/span>mesma frequ\u00eancia.<\/b><\/span><\/span><\/p>\n

Esse fato \u00e9\u00a0<\/b><\/span><\/span>explicado pelo fen\u00f4meno de<\/b><\/span><\/span><\/p>\n

(A)<\/b><\/span><\/span>\u00a0resson\u00e2ncia.<\/b><\/span><\/span><\/p>\n

(B)<\/b><\/span><\/span>\u00a0difra\u00e7\u00e3o.\u00a0<\/b><\/span><\/span><\/p>\n

(C)\u00a0<\/b><\/span><\/span>interfer\u00eancia.\u00a0<\/b><\/span><\/span><\/p>\n

(D)<\/b><\/span><\/span>\u00a0dispers\u00e3o.<\/b><\/span><\/span><\/p>\n

(E) <\/b><\/span><\/span>reverbera\u00e7\u00e3o.<\/b><\/span><\/span><\/p>\n

Efeito Doppler<\/span><\/span><\/span><\/p>\n

25-(FGV-RJ-017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Um\u00a0<\/b><\/span><\/span>carro trafega a 20 m\/s em uma estrada reta.<\/b><\/span><\/span><\/p>\n

O carro se\u00a0<\/b><\/span><\/span>aproxima de uma pessoa, parada no acostamento,\u00a0<\/b><\/span><\/span>querendo atravessar a estrada.<\/b><\/span><\/span><\/p>\n

O\u00a0<\/b><\/span><\/span>motorista do carro,\u00a0<\/b><\/span><\/span>para alert\u00e1-la, toca a\u00a0<\/b><\/span><\/span>buzina,\u00a0<\/b><\/span><\/span>cujo som, por\u00a0<\/b><\/span><\/span>ele ouvido, tem 640 Hz.<\/b><\/span><\/span><\/p>\n

\"\"\"\"<\/p>\n

A\u00a0<\/b><\/span><\/span>frequ\u00eancia do som da buzina percebida pela pessoa parada\u00a0<\/b><\/span><\/span>\u00e9, aproximadamente,<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

 <\/p>\n

26-(AFA \u2013 016\/017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Duas fontes sonoras 1 e 2,<\/b><\/span><\/span>\u00a0de\u00a0<\/b><\/span><\/span>massas desprez\u00edveis,\u00a0<\/b><\/span><\/span>que\u00a0<\/b><\/span><\/span>emitem sons, respectivamente,<\/b><\/span><\/span>\u00a0de\u00a0<\/b><\/span><\/span>frequ\u00eancias f1\u00a0= 570 Hz e f2\u00a0= 390 Hz\u00a0<\/b><\/span><\/span>s\u00e3o\u00a0<\/b><\/span><\/span>colocadas em um sistema, em repouso,\u00a0<\/b><\/span><\/span>constitu\u00eddo por\u00a0<\/b><\/span><\/span>dois<\/b><\/span><\/span>\u00a0<\/b><\/span>blocos, A e B, unidos por um fio ideal e inextens\u00edvel,\u00a0<\/b><\/span><\/span>de tal forma que uma\u00a0<\/b><\/span><\/span>mola ideal se encontra comprimida entre eles, como mostra a figura abaixo.<\/b><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

A\u00a0<\/b><\/span><\/span>fonte sonora 1\u00a0<\/b><\/span><\/span>est\u00e1\u00a0<\/b><\/span><\/span>acoplada ao bloco A,\u00a0<\/b><\/span><\/span>de\u00a0<\/b><\/span><\/span>massa 2m,\u00a0<\/b><\/span><\/span>e a\u00a0<\/b><\/span><\/span>fonte sonora 2 ao bloco B,\u00a0<\/b><\/span><\/span>de\u00a0<\/b><\/span><\/span>massa m. Um observador O, estacion\u00e1rio em rela\u00e7\u00e3o ao solo, dispara<\/b><\/span><\/span>\u00a0um mecanismo que\u00a0<\/b><\/span><\/span>rompe o fio.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Os\u00a0<\/b><\/span><\/span>blocos passam,\u00a0<\/b><\/span><\/span>ent\u00e3o, a se\u00a0<\/b><\/span><\/span>mover, separados da mola, com velocidades constantes em rela\u00e7\u00e3o ao solo<\/b><\/span><\/span>, sendo que a\u00a0<\/b><\/span><\/span>velocidade do bloco B \u00e9 de 80 m\/s.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Considere que\u00a0<\/b><\/span><\/span>n\u00e3o existam for\u00e7as dissipativas, <\/b><\/span><\/span>que a\u00a0<\/b><\/span><\/span>velocidade do som no local<\/b><\/span><\/span>\u00a0\u00e9 constante e\u00a0<\/b><\/span><\/span>igual a 340 m\/s,\u00a0<\/b><\/span><\/span>que\u00a0<\/b><\/span><\/span>o ar se encontra em repouso em rela\u00e7\u00e3o ao solo.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Nessas condi\u00e7\u00f5es, a\u00a0<\/b><\/span><\/span>raz\u00e3o entre as frequ\u00eancias sonoras percebidas pelo observador, devido ao movimento das fontes 2 e 1, respectivamente,<\/b><\/span><\/span>\u00a0\u00e9<\/b><\/span><\/span><\/span><\/span><\/p>\n

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 <\/p>\n

27-(ENEM-MEC-016)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

Qualidades fisiol\u00f3gicas do som<\/span><\/span><\/span><\/p>\n

28-(ACAFE MEDICINA-SC-017)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

O aparelho auditivo humano distingue nas ondas sonoras 3 qualidades: altura, intensidade e timbre.<\/b><\/span><\/span><\/p>\n

Com base no exposto,\u00a0<\/b><\/span><\/span>marque com\u00a0V\u00a0as afirma\u00e7\u00f5es\u00a0verdadeiras\u00a0e com\u00a0Fas\u00a0falsas.<\/b><\/span><\/span><\/p>\n

( )\u00a0<\/b><\/span><\/span>O\u00a0<\/b><\/i><\/span><\/span>timbre muda\u00a0<\/b><\/i><\/span><\/span>quando\u00a0<\/b><\/i><\/span><\/span>adiciona-se a uma onda sonora um de seus harm\u00f4nicos<\/b><\/i><\/span><\/span><\/p>\n

( )\u00a0<\/b><\/span><\/span>A\u00a0<\/b><\/i><\/span><\/span>intensidade<\/b><\/i><\/span><\/span>\u00a0da onda sonora\u00a0<\/b><\/i><\/span><\/span>diminui ao se reduzir o comprimento de onda.<\/b><\/i><\/span><\/span><\/p>\n

( )\u00a0<\/b><\/span><\/span>A\u00a0<\/b><\/i><\/span><\/span>altura<\/b><\/i><\/span><\/span>\u00a0da onda sonora\u00a0<\/b><\/i><\/span><\/span>aumenta\u00a0<\/b><\/i><\/span><\/span>quando\u00a0<\/b><\/i><\/span><\/span>a frequ\u00eancia aumenta<\/b><\/i><\/span><\/span>.<\/b><\/i><\/span><\/span><\/p>\n

( )\u00a0<\/b><\/span><\/span>Percebe-se a onda sonora duas vezes mais intensa<\/b><\/i><\/span><\/span>\u00a0quando se\u00a0<\/b><\/i><\/span><\/span>dobra a pot\u00eancia ac\u00fastica.<\/b><\/i><\/span><\/span><\/p>\n

A sequ\u00eancia\u00a0correta\u00a0\u00e9:<\/b><\/span><\/span><\/p>\n

a) F \u2013 V \u2013 V \u2013 V<\/b><\/span><\/span><\/p>\n

b) V \u2013 F \u2013 V \u2013 F<\/b><\/span><\/span><\/p>\n

c) F \u2013 F \u2013 V \u2013 F<\/b><\/span><\/span><\/p>\n

d) V \u2013 F \u2013 V \u2013 V<\/b><\/span><\/span><\/p>\n

29-(ENEM-MEC-2014)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

Quando adolescente<\/b><\/span><\/span>, as nossas tardes, ap\u00f3s as aulas, consistiam em tomar \u00e0s m\u00e3os o\u00a0<\/b><\/span><\/span>viol\u00e3o e o <\/b><\/span><\/span>dicion\u00e1rio de acordes de Almir Chediak<\/b><\/span><\/span>\u00a0e desafiar nosso amigo Hamilton a descobrir,\u00a0<\/b><\/span><\/span>apenas ouvindo o acorde, quais notas eram escolhidas<\/b><\/span><\/span>. Sempre perd\u00edamos a aposta,\u00a0<\/b><\/span><\/span>ele possui o ouvido absoluto.
\n<\/b><\/span><\/span>O\u00a0<\/b><\/span><\/span>ouvido absoluto<\/b><\/span><\/span>\u00a0\u00e9 uma caracter\u00edstica perceptual de poucos indiv\u00edduos <\/b><\/span><\/span>capazes de identificar notas isoladas<\/b><\/span><\/span>\u00a0sem outras refer\u00eancias, isto \u00e9, sem precisar relacion\u00e1-las com outras notas de uma melodia.
\n<\/b><\/span><\/span>LENT, R.\u00a0O c\u00e9rebro do meu professor de acorde\u00e3o. Dispon\u00edvel em: http:\/\/cienciahoje.uol.com.br Acesso em: 15 ago. 2012 (adaptado).
\nNo\u00a0<\/b><\/span><\/span>contexto apresentado, a propriedade f\u00edsica das ondas que permite essa distin\u00e7\u00e3o entre as notas \u00e9 a<\/b><\/span><\/span><\/p>\n

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 <\/p>\n

30-ENEM-MEC-016)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

a)<\/b><\/span><\/span>\u00a0Intensidade\u00a0<\/b><\/span><\/span>diminu\u00edda<\/b><\/span><\/span>, o tempo de retorno\u00a0<\/b><\/span><\/span>aumentado<\/b><\/span><\/span>\u00a0e a frequ\u00eancia percebida\u00a0<\/b><\/span><\/span>diminu\u00edda.\u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

b)<\/b><\/span><\/span>\u00a0Intensidade\u00a0<\/b><\/span><\/span>aumentada,<\/b><\/span><\/span>\u00a0o tempo de retorno\u00a0<\/b><\/span><\/span>diminu\u00eddo\u00a0<\/b><\/span><\/span>e a frequ\u00eancia percebida\u00a0<\/b><\/span><\/span>diminu\u00edda.\u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

c)<\/b><\/span><\/span>\u00a0Intensidade\u00a0<\/b><\/span><\/span>diminu\u00edda,<\/b><\/span><\/span>\u00a0o tempo de retorno\u00a0<\/b><\/span><\/span>diminu\u00eddo<\/b><\/span><\/span>\u00a0e a frequ\u00eancia percebida\u00a0<\/b><\/span><\/span>aumentada.<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

d)<\/b><\/span><\/span>\u00a0Intensidade\u00a0<\/b><\/span><\/span>diminu\u00edda,<\/b><\/span><\/span>\u00a0o tempo de retorno\u00a0<\/b><\/span><\/span>aumentado\u00a0<\/b><\/span><\/span>e a frequ\u00eancia percebida\u00a0<\/b><\/span><\/span>aumentada.<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span><\/span><\/p>\n

e)<\/b><\/span><\/span>\u00a0Intensidade\u00a0<\/b><\/span><\/span>aumentada<\/b><\/span><\/span>, o tempo de retorno\u00a0<\/b><\/span><\/span>aumentado\u00a0<\/b><\/span><\/span>e a frequ\u00eancia percebida\u00a0<\/b><\/span><\/span>aumentada.<\/b><\/span><\/span><\/span><\/span><\/p>\n

 <\/p>\n

31-(ENEM-MEC-015)<\/b><\/span><\/span><\/span><\/p>\n

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Cordas vibrantes<\/span><\/span><\/span><\/p>\n

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32-(PUC-SP-017)<\/b><\/span><\/span><\/span><\/span><\/span><\/p>\n

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Considere um\u00a0<\/b><\/span><\/span>sistema formado\u00a0<\/b><\/span><\/span>por\u00a0<\/b><\/span><\/span>duas cordas el\u00e1sticas diferentes,\u00a0<\/b><\/span><\/span>com <\/b><\/span><\/span>densidades lineares \u00b5<\/b><\/span><\/span>1<\/b><\/span><\/sub><\/span>\u00a0e \u00b5<\/b><\/span><\/span>2<\/b><\/span><\/sub><\/span>,\u00a0<\/b><\/span><\/span>tal que\u00a0<\/b><\/span><\/span>\u00b5<\/b><\/span><\/span>1<\/b><\/span><\/sub><\/span>\u00a0> \u00b5<\/b><\/span><\/span>2<\/b><\/span><\/sub><\/span>.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Na\u00a0<\/b><\/span><\/span>corda de densidade linear \u00b51<\/b><\/span><\/span>\u00a0<\/b><\/span>\u00e9\u00a0<\/b><\/span><\/span>produzido um pulso que se desloca com velocidade constante<\/b><\/span><\/span>\u00a0e\u00a0<\/b><\/span><\/span>igual a v<\/b><\/span><\/span>, conforme\u00a0<\/b><\/span><\/span>indicado na figura.<\/b><\/span><\/span><\/span><\/span>\"\"<\/p>\n

Ap\u00f3s um intervalo de tempo \u0394t,\u00a0<\/b><\/span><\/span>depois de o <\/b><\/span><\/span>pulso atingir a jun\u00e7\u00e3o das duas cordas, verifica-se\u00a0<\/b><\/span><\/span>que o\u00a0<\/b><\/span><\/span>pulso refratado percorreu uma dist\u00e2ncia 3 vezes maior que a dist\u00e2ncia percorrida pelo pulso refletido.<\/b><\/span><\/span><\/span><\/span><\/p>\n

Com\u00a0<\/b><\/span><\/span>base nessas informa\u00e7\u00f5es,\u00a0<\/b><\/span><\/span>podemos\u00a0<\/b><\/span><\/span>afirmar, respectivamente,\u00a0<\/b><\/span><\/span>que a <\/b><\/span><\/span>rela\u00e7\u00e3o entre as densidades lineares das duas cordas\u00a0<\/b><\/span><\/span>e que as\u00a0<\/b><\/span><\/span>fases dos pulsos refletido e refratado\u00a0<\/b><\/span><\/span>est\u00e3o\u00a0<\/b><\/span><\/span>corretamente relacionados na alternativa:<\/b><\/span><\/span><\/span><\/span><\/p>\n

(A) \u00b5<\/b><\/span><\/span>1<\/b><\/span><\/sub><\/span>\u00a0= 3.\u00b5<\/b><\/span><\/span>2<\/b><\/span><\/sub><\/span>, o\u00a0<\/b><\/span><\/span>pulso refletido sofre invers\u00e3o de fase\u00a0<\/b><\/span><\/span>mas o pulso<\/b><\/span><\/span>refratado n\u00e3o sofre invers\u00e3o de fase.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(B) \u00b5<\/b><\/span><\/span>1<\/b><\/span><\/sub><\/span>\u00a0= 3.\u00b5<\/b><\/span><\/span>2<\/b><\/span><\/sub><\/span>,<\/b><\/span><\/span>\u00a0os\u00a0<\/b><\/span><\/span>pulsos refletido e refratado n\u00e3o sofrem invers\u00e3o de fase.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(C) \u00b5<\/b><\/span><\/span>1<\/b><\/span><\/sub><\/span>\u00a0= 9.\u00b5<\/b><\/span><\/span>2<\/b><\/span><\/sub><\/span>,\u00a0<\/b><\/span><\/span>o\u00a0<\/b><\/span><\/span>pulso refletido n\u00e3o sofre invers\u00e3o de fase\u00a0<\/b><\/span><\/span>mas o\u00a0<\/b><\/span><\/span>pulso refratado sofre invers\u00e3o de fase.<\/b><\/span><\/span><\/span><\/span><\/p>\n

(D) \u00b5<\/b><\/span><\/span>1<\/b><\/span><\/sub><\/span>\u00a0= 9.\u00b5<\/b><\/span><\/span>2<\/b><\/span><\/sub><\/span>,\u00a0<\/b><\/span><\/span>os\u00a0<\/b><\/span><\/span>pulsos refletido e refratado n\u00e3o sofrem invers\u00e3o de fase.<\/b><\/span><\/span><\/span><\/span><\/p>\n

 <\/p>\n

 <\/p>\n

Tubos sonoros<\/span><\/span><\/span><\/p>\n

33-(FPS-Faculdade Pernambucana de Sa\u00fade-PE-2017)<\/b><\/span><\/span><\/span><\/p>\n

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34-(Faculdade Israelita de Ci\u00eancias da Sa\u00fade Albert Einstein \u2013 SP \u2013 016)<\/b><\/span><\/span><\/span><\/p>\n

Em 1816 o m\u00e9dico franc\u00eas\u00a0<\/b><\/span><\/span>Ren\u00e9 La\u00ebnnec,\u00a0<\/b><\/span><\/span>durante um exame cl\u00ednico numa senhora, teve a ideia de\u00a0<\/b><\/span><\/span>enrolar uma folha de papel bem apertada\u00a0<\/b><\/span><\/span>e colocar\u00a0<\/b><\/span><\/span>seu ouvido numa das extremidades<\/b><\/span><\/span>, deixando a\u00a0<\/b><\/span><\/span>outra livre\u00a0<\/b><\/span><\/span>para ser encostada na paciente. Dessa forma, n\u00e3o s\u00f3 era evitado o contato indesejado com a paciente, como os\u00a0<\/b><\/span><\/span>sons se tornavam muito mais aud\u00edveis.\u00a0<\/b><\/span><\/span>Estava criada assim a ideia fundamental\u00a0<\/b><\/span><\/span>do estetosc\u00f3pio [do grego, \u201cst\u00eathos\u201d (peito) \u201cskop\u00e9o\u201d (olhar)].<\/b><\/span><\/span><\/p>\n

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\u00c9 utilizado por\u00a0<\/b><\/span><\/span>diversos profissionais,\u00a0<\/b><\/span><\/span>como\u00a0<\/b><\/span><\/span>m\u00e9dicos e enfermeiros,<\/b><\/span><\/span>\u00a0para <\/b><\/span><\/span>auscultar<\/b><\/span><\/span>\u00a0(termo t\u00e9cnico correspondente a escutar)\u00a0<\/b><\/span><\/span>sons vasculares, respirat\u00f3rios<\/b><\/span><\/span>\u00a0ou de outra natureza em <\/b><\/span><\/span>diversas regi\u00f5es do corpo.<\/b><\/span><\/span>\u00a0\u00c9 composto por\u00a0<\/b><\/span><\/span>tr\u00eas partes fundamentais.\u00a0<\/b><\/span><\/span>A\u00a0<\/b><\/span><\/span>pe\u00e7a auricular\u00a0<\/b><\/span><\/span>tem formato anat\u00f4mico para\u00a0<\/b><\/span><\/span>adaptar-se ao canal auditivo.<\/b><\/span><\/span><\/p>\n

Os\u00a0<\/b><\/span><\/span>tubos condutores do som<\/b><\/span><\/span>\u00a0a conectam \u00e0 pe\u00e7a auscultat\u00f3ria.<\/b><\/span><\/span><\/p>\n

E, por fim, a\u00a0<\/b><\/span><\/span>pe\u00e7a auscultat\u00f3ria,<\/b><\/span><\/span>\u00a0componente met\u00e1lico\u00a0<\/b><\/span><\/span>colocado em contato\u00a0<\/b><\/span><\/span>com o corpo do paciente. Essa pe\u00e7a \u00e9 composta por uma <\/b><\/span><\/span>camp\u00e2nula,<\/b><\/span><\/span>\u00a0que\u00a0<\/b><\/span><\/span>transmite melhor os sons de baixa frequ\u00eancia<\/b><\/span><\/span>\u00a0\u2013 como as <\/b><\/span><\/span>batidas do cora\u00e7\u00e3o\u00a0<\/b><\/span><\/span>\u2013 e o\u00a0<\/b><\/span><\/span>diafragma,\u00a0<\/b><\/span><\/span>que\u00a0<\/b><\/span><\/span>transmite melhor os sons de alta frequ\u00eancia, como os do pulm\u00e3o e do abd\u00f4men. A folha de papel\u00a0<\/b><\/span><\/span>enrolada pelo m\u00e9dico franc\u00eas Ren\u00e9 La\u00ebnnec pode ser\u00a0<\/b><\/span><\/span>interpretada como um tubo sonoro aberto.\u00a0<\/b><\/span><\/span>Considerando o\u00a0<\/b><\/span><\/span>comprimento desse tubo igual a 34cm e que, ao auscultar um paciente, houve a forma\u00e7\u00e3o, no interior desse tubo, de uma onda estacion\u00e1ria longitudinal de segundo harm\u00f4nico e que se propagava com uma velocidade de 340m\/s, qual a frequ\u00eancia dessa onda, em hertz?<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

\u00a0<\/span><\/p>\n

35-(FUVEST-SP-015)<\/b><\/span><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"\"<\/p>\n

A\u00a0<\/b><\/span><\/span>figura acima<\/b><\/span><\/span>\u00a0mostra parte do teclado de um\u00a0<\/b><\/span><\/span>piano<\/b><\/span><\/span>. Os\u00a0<\/b><\/span><\/span>valores das frequ\u00eancias das notas<\/b><\/span><\/span><\/p>\n

sucessivas<\/b><\/span><\/span>,\u00a0<\/b><\/span><\/span>incluindo os sustenidos<\/b><\/span><\/span>, representados pelo\u00a0<\/b><\/span><\/span>s\u00edmbolo\u00a0\"\"<\/b><\/span><\/span>,<\/b><\/span><\/span>obedecem a uma\u00a0<\/b><\/span><\/span>progress\u00e3o geom\u00e9trica<\/b><\/span><\/span>\u00a0<\/b><\/span><\/span>crescente da esquerda para a direita<\/b><\/span><\/span>; a\u00a0<\/b><\/span><\/span>raz\u00e3o entre as frequ\u00eancias de duas notas D\u00f3<\/b><\/span><\/span><\/p>\n

consecutivas vale 2<\/b><\/span><\/span>; a\u00a0<\/b><\/span><\/span>frequ\u00eancia da\u00a0<\/b><\/span><\/span>nota L\u00e1<\/b><\/span><\/span>\u00a0do teclado da figura \u00e9\u00a0<\/b><\/span><\/span>440 Hz.<\/b><\/span><\/span>\u00a0O\u00a0<\/b><\/span><\/span>comprimento de onda<\/b><\/span><\/span>, no ar, da\u00a0<\/b><\/span><\/span>nota Sol indicada na figura \u00e9 pr\u00f3ximo de<\/b><\/span><\/span><\/p>\n

\"\"<\/p>\n

\"Ondulat\u00f3ria\"<\/p>\n

Confira as resolu\u00e7\u00f5es comentadas<\/span><\/a><\/h3>\n

 <\/p>\n

Clique aqui para ver sobre o tema!<\/a><\/p>\n

Confira as v\u00eddeo aulas!<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Vestibulares Recentes \u2013 Ondulat\u00f3ria \u2013 2017 \u2013 2016 – 2015 ONDAS – Conceitos e defini\u00e7\u00f5es 01-(UNESP-SP-017) Radares s\u00e3o emissores e receptores de ondas de r\u00e1dio\u00a0e t\u00eam\u00a0aplica\u00e7\u00f5es, por exemplo, na\u00a0determina\u00e7\u00e3o de velocidades de ve\u00edculos nas ruas e rodovias. J\u00e1 os\u00a0sonares s\u00e3o emissores e receptores de ondas sonoras,\u00a0sendo utilizados\u00a0no meio aqu\u00e1tico\u00a0para\u00a0determina\u00e7\u00e3o da profundidade dos oceanos, localiza\u00e7\u00e3o de cardumes, dentre outras aplica\u00e7\u00f5es. Comparando-se<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3368,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-3370","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3370","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/comments?post=3370"}],"version-history":[{"count":4,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3370\/revisions"}],"predecessor-version":[{"id":9928,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3370\/revisions\/9928"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3368"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=3370"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}