{"id":4835,"date":"2020-01-09T13:06:35","date_gmt":"2020-01-09T13:06:35","guid":{"rendered":"http:\/\/fisicaevestibular.com.br\/novo\/?page_id=4835"},"modified":"2024-09-04T14:15:37","modified_gmt":"2024-09-04T14:15:37","slug":"vestibulares-recentes-fisica-moderna-1018-2019-resolucao-comentada","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/vestibulares-recentes\/fisica-moderna\/fisica-moderna-2018-2019\/vestibulares-recentes-fisica-moderna-1018-2019-resolucao-comentada\/","title":{"rendered":"Vestibulares Recentes \u2013 F\u00edsica Moderna \u2013 1018\/2019 \u2013 Resolu\u00e7\u00e3o Comentada"},"content":{"rendered":"

Vestibulares Recentes \u2013 F\u00edsica Moderna \u2013 1018\/2019 \u2013 Resolu\u00e7\u00e3o Comentada<\/b><\/span><\/span><\/span><\/p>\n

01-<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

R- E<\/b><\/span><\/span><\/span><\/p>\n

 <\/p>\n

02-<\/b><\/span><\/span><\/span><\/p>\n

E = h.f\u00a0<\/b><\/span><\/span>\u00a0F.d = h.1\/T\u00a0\u00a0h = F.d.T = m.a.d.T\u00a0\u00a0h = kg.m\/s2.m.s\u00a0\u00a0<\/b><\/span><\/span>h = kg.m2\/s<\/b><\/span><\/span><\/span><\/span><\/p>\n

R- A<\/b><\/span><\/span><\/span><\/span><\/p>\n

03-<\/b><\/span><\/span><\/span><\/p>\n

Postulados da Relatividade Especial<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

R- B<\/b><\/span><\/span><\/span><\/p>\n

04-<\/b><\/span><\/span><\/span><\/p>\n

R- C<\/b><\/span><\/span><\/span><\/p>\n

05-<\/b><\/span><\/span><\/span><\/p>\n

Modelo at\u00f4mico de Bohr<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

C\u00e1lculo da energia (W) contida em um f\u00f3ton<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

E = E2\u00a0\u2013 E1<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>= \u2013 1,28 eV \u2013 (- 2,93 eV) = 1,65 eVx1,6.10-19<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>= 2,64.10-19\u00a0J; h = 6,6.10-34\u00a0J.s e f = ?<\/b><\/span><\/span><\/span><\/p>\n

E = h.f\u00a0<\/b><\/span><\/span><\/span>\u00a02,64.10-19\u00a0= 6,6.10-34.f\u00a0\u00a0f = 2,64.10-19\/6,6.10-34\u00a0= 0,4.1015\u00a0\u00a0<\/b><\/span><\/span><\/span>f = 4 . 1014\u00a0Hz.<\/b><\/span><\/span><\/span><\/p>\n

R- A<\/b><\/span><\/span><\/span><\/p>\n

06-<\/b><\/span><\/span><\/span><\/p>\n

O\u00a0<\/b><\/span><\/span><\/span>f\u00f3ton,\u00a0<\/b><\/span><\/span><\/span>como qualquer part\u00edcula, possui\u00a0<\/b><\/span><\/span><\/span>certa energia (W),\u00a0<\/b><\/span><\/span><\/span>e a\u00a0<\/b><\/span><\/span><\/span>rela\u00e7\u00e3o energia (W)<\/b><\/span><\/span><\/span>\u00a0e\u00a0<\/b><\/span><\/span><\/span>frequ\u00eancia (f),\u00a0\u00e9 proporcional<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>e est\u00e1\u00a0<\/b><\/span><\/span><\/span>relacionada por uma constante, a\u00a0constante de Planck\u00a0(h).<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

<\/p>\n

07-<\/b><\/span><\/span><\/span><\/p>\n

Analisando as hip\u00f3teses come\u00e7ando pela I. Sabemos que<\/b><\/span><\/span><\/span>\u00a0<\/b><\/span><\/span><\/span>pelo efeito fotoel\u00e9trico:<\/b><\/span><\/span><\/span><\/p>\n

<\/p>\n

Isolando a energia cin\u00e9tica temos:<\/b><\/span><\/span><\/span><\/p>\n

Ent\u00e3o\u00a0<\/b><\/span><\/span><\/span>a energia cin\u00e9tica e proporcional \u00e0 frequ\u00eancia,<\/b><\/span><\/span><\/span>\u00a0admitindo que estamos acima da fun\u00e7\u00e3o trabalho, ent\u00e3o\u00a0<\/b><\/span><\/span><\/span>quanto maior a frequ\u00eancia, maior a energia cin\u00e9tica dos el\u00e9trons que saem da amostra. Hip\u00f3tese I \u00e9 verdadeira.<\/b><\/span><\/span><\/span><\/p>\n

Quanto\u00a0<\/b><\/span><\/span><\/span>mais pr\u00f3ximo o el\u00e9tron se encontra do n\u00facleo, maior \u00e9 a for\u00e7a de atra\u00e7\u00e3o que \u00e9 sentida por ele,<\/b><\/span><\/span><\/span>\u00a0ent\u00e3o\u00a0<\/b><\/span><\/span><\/span>sua energia de cin\u00e9tica de sa\u00edda \u00e9 menor,\u00a0<\/b><\/span><\/span><\/span>pois \u00e9 muito mais dif\u00edcil tirar ele de l\u00e1.\u00a0<\/b><\/span><\/span><\/span>Hip\u00f3tese II \u00e9 verdadeira.<\/b><\/span><\/span><\/span><\/p>\n

Todas as\u00a0<\/b><\/span><\/span><\/span>energias de liga\u00e7\u00e3o s\u00e3o sempre quantizadas,\u00a0<\/b><\/span><\/span><\/span>isso foi provado por Planck e posteriormente adicionado ao modelo at\u00f4mico por Bohr.\u00a0<\/b><\/span><\/span><\/span>Hip\u00f3tese III \u00e9 verdadeira<\/b><\/span><\/span><\/span><\/h2>\n

Voltar para os exerc\u00edcios<\/a><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Vestibulares Recentes \u2013 F\u00edsica Moderna \u2013 1018\/2019 \u2013 Resolu\u00e7\u00e3o Comentada 01- R- E   02- E = h.f\u00a0\u00a0F.d = h.1\/T\u00a0\u00a0h = F.d.T = m.a.d.T\u00a0\u00a0h = kg.m\/s2.m.s\u00a0\u00a0h = kg.m2\/s R- A 03- Postulados da Relatividade Especial R- B 04- R- C 05- Modelo at\u00f4mico de Bohr C\u00e1lculo da energia (W) contida em um f\u00f3ton E = E2\u00a0\u2013 E1\u00a0= \u2013 1,28 eV<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":4833,"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-4835","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4835","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=4835"}],"version-history":[{"count":4,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4835\/revisions"}],"predecessor-version":[{"id":11078,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4835\/revisions\/11078"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/4833"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=4835"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}