{"id":12221,"date":"2024-12-04T16:26:19","date_gmt":"2024-12-04T16:26:19","guid":{"rendered":"https:\/\/fisicaevestibular.com.br\/novo\/?page_id=12221"},"modified":"2024-12-04T16:26:19","modified_gmt":"2024-12-04T16:26:19","slug":"modern-physics-2018-2019","status":"publish","type":"page","link":"https:\/\/fisicaevestibular.com.br\/novo\/vestibulares-recentes\/fisica-moderna\/modern-physics-2018-2019\/","title":{"rendered":"MODERN PHYSICS \u2013 2018 \u2013 2019"},"content":{"rendered":"

Recent Entrance Exams \u2013 Modern Physics \u2013 2018\/2019<\/p>\n

01- (ABC Medical School \u2013 FMABC \u2013 SP \u2013 019)<\/p>\n

<\/p>\n

In 1990,\u00a0\u00a0Max Planck proposed that the radiation emitted by a source is not continuous,\u00a0\u00a0but rather\u00a0\u00a0composed of discontinuous portions.<\/p>\n

<\/p>\n

In\u00a0\u00a0current language, we say that the radiation emitted by a source is composed of photons, whose energy is given by the relation Ef = hf, proposed by Planck,\u00a0\u00a0where\u00a0\u00a0Ef is the energy of each photon emitted, h is a constant with a value of 6.63.10\u221234 J . iff is the frequency of the radiation.<\/p>\n

Assuming that\u00a0\u00a0a lamp emits radiation with a power of 8.0 W and a frequency of 6.0.1014 Hz, the number<\/p>\n

<\/p>\n

of photons that it emits every second is a value close\u00a0\u00a0to<\/p>\n

a)\u00a0\u00a04.0.1019.<\/p>\n

b)\u00a0\u00a08.0.1019.<\/p>\n

c)\u00a0\u00a02.0.1014.<\/p>\n

d)\u00a0\u00a04.0.1014.<\/p>\n

e)\u00a0\u00a02.0.1019.<\/p>\n

02- (UDESC-SC-019)<\/p>\n

<\/p>\n

In 1900\u00a0\u00a0Max Planck proposed the quantization of energy\u00a0\u00a0to explain\u00a0\u00a0blackbody radiation\u00a0.<\/p>\n

<\/p>\n

Planck’s postulate\u00a0\u00a0proposes that energy is given by E = nhf,\u00a0\u00a0where\u00a0\u00a0E\u00a0 is\u00a0the\u00a0\u00a0energy,\u00a0n is\u00a0\u00a0an\u00a0\u00a0integer, f is\u00a0\u00a0the\u00a0\u00a0frequency\u00a0\u00a0and\u00a0\u00a0h is\u00a0\u00a0a\u00a0\u00a0constant that later became known as Planck’s constant.<\/p>\n

Select the\u00a0\u00a0alternative that corresponds to the unit of measurement in the international system of units\u00a0.<\/p>\n

A.\u00a0\u00a0<\/span>( ) Kg.m2\/s\u00a0\u00a0<\/span>B.\u00a0<\/span>\u00a0( ) Kg.m\/s\u00a0\u00a0<\/span>C.\u00a0\u00a0<\/span>( ) Kg.m2\/s2\u00a0<\/span>D.\u00a0\u00a0<\/span>( ) Kg.m\/s\u00a0\u00a0<\/span>E.\u00a0\u00a0<\/span>( ) Kg.m\/s2<\/span>\u00a0<\/span><\/p>\n

03- (State University of Central-West Paran\u00e1 \u2013 UNICENTRO \u2013 019)<\/p>\n

<\/p>\n

The\u00a0\u00a0theory of special relativity, published in 1905 by the German Albert Einstein,\u00a0\u00a0impacted\u00a0\u00a0several areas of human knowledge and completely changed the way we observe and understand the universe around us.<\/p>\n

It\u00a0\u00a0mainly dealt with the differences between physical phenomena observed from different reference frames.<\/p>\n

The\u00a0\u00a0theory of special relativity was structured based on the following postulates:<\/p>\n

I.\u00a0The laws of physics are the same for observers in any inertial frame of reference.\u00a0\u00a0II.\u00a0The laws of physics are the same for observers in any non-inertial frame of reference.<\/p>\n

III.\u00a0The speed of light in a vacuum has the same value regardless of the movement of the source or the observer’s reference system.<\/p>\n

Regarding the postulates described above, identify which ones are correct.<\/p>\n

a)\u00a0\u00a0Only postulate III is correct.<\/p>\n

b)\u00a0\u00a0The correct postulates are I and III.<\/p>\n

c)\u00a0\u00a0All postulates are correct.<\/p>\n

d)\u00a0\u00a0The correct postulates are II and III.<\/p>\n

e)\u00a0\u00a0The correct postulates are I and II.<\/p>\n

04-(UEMG-MG-019)<\/p>\n

<\/p>\n

<\/p>\n

05- Federal University of Uberl\u00e2ndia \u2013 UFU \u2013 MG \u2013 mid-year \u2013 2019\/2020<\/p>\n

<\/p>\n

There are processes that occur in the electronic structure of atoms in which an electron can gain or lose energy.\u00a0In these processes\u00a0, the\u00a0\u00a0electron passes from one energy level to another, and the energy difference between these two levels, in some of these processes, can be emitted as a photon of light.<\/p>\n

<\/p>\n

The\u00a0\u00a0photon has energy that can be determined by a direct relationship with the frequency of light through the equation E = h . f, where E is the energy of the photon, h is Planck’s constant (h = 6.6 x 10-34 Js) and f is the frequency of the emitted light.\u00a0\u00a0In these situations,\u00a0\u00a0a widely used unit of energy is the electronvolt (eV), where 1 eV = 1.6 x 10-19 J.<\/p>\n

Consider two electronic energy levels with values \u200b\u200bof E1 = -2.93 eV and E2 = -1.28 eV, and an electron that decays from level E2 to level E1, emitting a photon.<\/p>\n

What is approximately the frequency of light associated with this photon?<\/p>\n

A)\u00a0\u00a04.00 x 1014 Hz<\/p>\n

B)\u00a0\u00a02.42 x 1015 Hz<\/p>\n

C)\u00a0\u00a01.00 x 1015 Hz<\/p>\n

D)\u00a0\u00a0<\/span>6.64 x 1013 Hz<\/span><\/p>\n

06- (FMABC-SP-018)<\/span><\/p>\n

<\/p>\n

\"Modern<\/p>\n

07- (UFJF-MG-018)<\/p>\n

<\/p>\n

Joyce works with\u00a0\u00a0photoelectron spectroscopy,\u00a0\u00a0which is a material characterization technique that\u00a0\u00a0involves bombarding a material with X-rays of a certain energy and measuring the kinetic energy of the electrons torn from the surface of the material.\u00a0\u00a0This makes it possible to determine the chemical composition and the type of bond between the atoms of the sample being studied. Joyce wants to\u00a0\u00a0study a sheet of graphene,\u00a0\u00a0which is a\u00a0\u00a0material composed solely of carbon atoms.\u00a0\u00a0To do this, she\u00a0\u00a0uses two X-ray sources, A and B, which have frequencies of fA and fB, respectively, with fA > fB.<\/p>\n

Three hypotheses\u00a0are formulated regarding this experiment\u00a0 :<\/p>\n

I \u2013 If\u00a0\u00a0we use source A,\u00a0\u00a0the\u00a0\u00a0electrons extracted\u00a0\u00a0from the graphene sheet\u00a0\u00a0reach the detector with a greater kinetic energy\u00a0\u00a0than that which would be measured if we used source B.<\/p>\n

II \u2013 The\u00a0\u00a0electrons extracted from the S level, which is the innermost electronic level of the atoms,\u00a0\u00a0will reach the detector\u00a0\u00a0with greater energy than the electrons from the P layer,\u00a0\u00a0as they\u00a0\u00a0are more weakly bound to the nucleus,\u00a0\u00a0requiring\u00a0\u00a0less energy to pull them out.<\/p>\n

III \u2013 The\u00a0\u00a0binding energy of electrons in carbon atoms is quantized.<\/p>\n

Select the CORRECT statement regarding the hypotheses formulated:<\/p>\n

Only I and II are correct.<\/p>\n

    \n
  1. Only I and III are correct.<\/li>\n
  2. Only I is correct.<\/li>\n
  3. I, II and III are correct.<\/li>\n
  4. Only II is correct.<\/li>\n<\/ol>\n

    Check out the commented resolution<\/a><\/h2>\n

    Click here to see more about the topic!<\/a><\/p>\n

    Check out the video classes!<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

    Recent Entrance Exams \u2013 Modern Physics \u2013 2018\/2019 01- (ABC Medical School \u2013 FMABC \u2013 SP \u2013 019) In 1990,\u00a0\u00a0Max Planck proposed that the radiation emitted by a source is not continuous,\u00a0\u00a0but rather\u00a0\u00a0composed of discontinuous portions. In\u00a0\u00a0current language, we say that the radiation emitted by a source is composed of photons, whose energy is given by the relation Ef =<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3386,"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-12221","page","type-page","status-publish","hentry"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/12221","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=12221"}],"version-history":[{"count":1,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/12221\/revisions"}],"predecessor-version":[{"id":12222,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/12221\/revisions\/12222"}],"up":[{"embeddable":true,"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/pages\/3386"}],"wp:attachment":[{"href":"https:\/\/fisicaevestibular.com.br\/novo\/wp-json\/wp\/v2\/media?parent=12221"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}