Physics Unit32: Elementary Particles - 51fly国际课程 (51fly.win)

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?作业考试练习?国际高中通用物理?Physics Unit32: Elementary Particles

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习题练习：Physics Unit32: Elementary Particles

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作者: physics 发布日期: 2023-05-02 09:40 总分: 43分得分: _____________

答题人: 匿名未登录开始时间: 23年05月02日 09:40 切换到: 整卷模式

1#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What happens to the cyclotron frequency of a charged qq 7llue .i(g1particle if its speed double(u qq.lgiel71 s?

A. It triples.

B. It doubles.

C. It halves.

D. It does not change.

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What happens to the cyclotron frequency of a charge kdf o;)+d.yeod particle if the radius of its path doubles? ;kyf.doe+o d)

A. It triples.

B. It doubles.

C. It halves.

D. It does not change.

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The Feynman diagram s n0 3l) rnt0jy4-fcqkuhows two electrons approaching each other, interacting, and then leaving each other. What particle ij) 0 u l-4qyrnc3t0kfns being exchanged during the interaction?

A. pion

B. virtual photon

C. neutrino

D. $W$ particle

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The Feynman diagram shows thuszej2i c8b0kb) pjos 2 / ,v2:3xwfupe weak interaction of a neutrino ($\nu$) and a neutron ($n$), mediated by a $W+$ particle. The interaction produces an electron ($e-$) and another particle. What is the other particle?

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A positively charged es7*hk8c deu0 electron is

A. called a proton.

B. called a positron.

C. also called an electron.

D. not found in nature.

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What effect does an increase in the mass of the virtual exchange particle.-,p+q bq2i((itvlk+mrn ksg have on the range lm(svbqni2+tip.- g rqk+(,k of the force it mediates?

A. decreases it

B. increases it

C. has no appreciable effect

D. decreases charged particle interactions and increases neutral particle interactions

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An exchange particle for t0d sgdhmuns.4r h*r*d8g 7qh+ he weak force is the

A. photon

B. meson

C. W particle

D. graviton

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8#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The exchange particles for the weak force are very massive 0z x d;ii*sqpr3w jxsnxq/v q-4g-*;v (about 100 times as massive as a proton). This would le*pjidv 4/wx-;svr-i qs* ; xnzqgq03x ad one to expect that the weak force would

A. act over a very long range.

B. act over a very short range.

C. only act on very massive particles.

D. be transmitted at the speed of light.

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9#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The exchange particle n6 ;i s46amyiryst+p:p1sox, for quarks is called

A. the stickon.

B. the gluon.

C. the epoxyon.

D. the epsilon.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A particle that travel/gq; , lx0rjc o-vfne jqvi e:m21;-jjs at the speed of light

A. has never been observed.

B. must have zero rest mass.

C. must have a very large rest mass.

D. has infinite energy.

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

One reason a photon could not create an odd numbeq)8wqqgt- zu5 r of electrons and positrons is that such a procg z)u8 wq5tqq-ess would

A. not conserve charge.

B. not conserve energy.

C. require photon energies that are not attainable.

D. result in the creation of mass.

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is the following decay permio z 8v4nfsc;/ lfnw;4dssible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

A. yes

B. No, because charge is not conserved.

C. No, because mass is created.

D. No, because lepton number is not conserved.

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13#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is the following decay urp2r 8()vlngallowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

A. yes

B. No, because charge is not conserved.

C. No, because mass is created.

D. No, because lepton number is not conserved.

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14#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Is the following decay (g f(( wv,fhsmallowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

A. yes

B. No, because charge is not conserved.

C. No, because mass is created.

D. No, because lepton number is not conserved.

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15#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The neutrino has

A. enormous rest mass, positive charge, and spin quantum number 1/2.

B. negligible rest mass, negative charge, and spin quantum number 1.

C. negligible rest mass, no charge, and spin quantum number 1/2.

D. none of the given answers

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16#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

An electron is an example ouug99of; ; xq 4jdic5ff

A. a lepton.

B. a meson.

C. a baryon.

D. a gauge boson.

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17#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A proton is an exampe8cu yz ae;neso a.),0le of

A. a lepton.

B. a meson.

C. a baryon.

D. a gauge boson.

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18#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A neutron is an examplek0vj2k x ouus7,.xx 2nl +wbr) of

A. a lepton.

B. a meson.

C. a baryon.

D. a gauge boson.

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19#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A photon is an example of;jvmn1-,jdp72bqhw tj li96 v

A. a lepton.

B. a meson.

C. a baryon.

D. a gauge boson.

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20#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Particles that do not interact via the strong force but z+bn2xooe8ha:ik2 3(vbqa e (do interact via the weak nuclear force be :eb(vn(ah23 o2aoqkz+8xi(and presumably by the much weaker gravitation force) are called

A. gauge bosons.

B. leptons.

C. baryons.

D. mesons.

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21#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Hadrons are divided into tf2r8(j g8n+u hya1( zwkpupr2wo subgroups called

A. baryons and leptons.

B. leptons and mesons.

C. mesons and baryons.

D. nucleons and gauge bosons.

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22#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A quark is

A. a constituent of a nucleon.

B. a constituent of a hadron.

C. an elementary particle.

D. all of the given answers

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23#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the quark com f 8h ocmh5un5v9g:wke6yee103edix :position of a $\Lambda^{\circ}$?

A. uud

B. uus

C. uds

D. uss

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24#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A distinctive feature of quarksiacqcrz .c:c+ps,n8p5x 2 p/x is that they

A. have zero rest mass.

B. have zero charge.

C. have fractional electric charge.

D. are always observed singly, since they do not readily interact with other particles.

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25#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The charge of some quarks and al8 )3vcxw)vi6xhdu/i j)5n.t+ujbyk ntiquarks is

A. e/4.

B. e/3.

C. e/2.

D. e.

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26#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a quark emits or absorbs a gluon, 3zy+zgp ((4b1oydc mtthe quark changes

A. its charge.

B. its mass.

C. its color.

D. into an antiquark.

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27#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The number of types of 1t( wwpkfguf.k:6ltpfs9* r 7 quarks is

A. 2.

B. 3.

C. 6.

D. 8.

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28#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Which of the following is not considered to be one of th3 ga ensskc8rljihiw7/ w+.06e four fundamental forces? i.ksh +7i/6gwsal380 jwrcen

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29#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A significant step in "uncb0:s j+0fh vz)s.ejoifying" the forces of nature was the discovery that two of the so-called fundamental forces were two parts of a single bvcej.+ zsj:fo)h00sforce. The two forces that were so unified were

A. the electromagnetic force and the weak force.

B. the electromagnetic force and the strong nuclear force.

C. the electromagnetic force and the gravity force.

D. the weak force and the strong nuclear force.

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30#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The grand unified theory (GUT) 4pj oirb zcf1i6(q(g1 is a sought-after model that would unify three of the four forces of nature. Which force is the one it would not includejcb461 qfi r (1gpz(oi?

A. gravitational

B. strong

C. weak

D. electromagnetic

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31#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What is the wavelength for a beam of 1.4 GeV electrnvc2na0 0)jk run4y p:ons?

A. $8.8 \times 10^{-14} \; m$

B. $8.8 \times 10^{-15} \; m$

C. $8.8 \times 10^{-16} \; m$

D. $8.8 \times 10^{-17} \; m$

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32#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclotron operates at 10 MHz. What +9f/fnph)ts -5v zw4ww+ehvbmd1ab7 magnetic field is needed to accelerate protows4wb 1 e-5+9/w+ banmh)d7hfzf vtvp ns?

A. $0.12 \; T$

B. $0.25 \; T$

C. $0.66 \; T$

D. $1.5 \; T$

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33#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclotron of radius 0.25 m accelerate xbqo)/7b2.cbsey1hes protons in a 1.7-T magnetic field. What is the frequence bbhq/2eb1x cy.7 s)oy for the applied alternating voltage?

A. $0.26 \; MHz$

B. $2.6 \; MHz$

C. $26 \; MHz$

D. $260 \; MHz$

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34#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A cyclotron of radius 0.25ort- (f/yqw-vgw *su*1 z s9ws m accelerates protons in a 1.7-T magnetic field. What is the sy(-zwwor *usf q/g 1-*9svt wkinetic energy of the protons when they leave the cyclotron?

A. $7.8 \; keV$

B. $8.7 \; keV$

C. $7.8 \; MeV$

D. $8.7 \; MeV$

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35#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

A deuteron has the same charge as a protybse6 u6gg )/ pf kn)di,8oy9ton but approximately twice the proton mass. Suppose deuterons)b89fn/g)u sde,o 6 ky6g ytpi are being accelerated in a cyclotron in an orbit of radius 75 cm at a frequency of 8.0 Mhz. What magnetic field is needed?

A. $0.011 \; T$

B. $0.11 \; T$

C. $1.1 \; T$

D. $11 \; T$

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36#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Suppose you were to try to create g* hdj.p7qmms;b8s;v a proton-antiproton pair by annihilation of a very highqsv7mjs;b 8 d*m.ph;g energy photon. The proton and the anti-proton have the same masses, but opposite charges. What energy photon would be required?

A. $1.022 \; MeV$

B. $1880 \; MeV$

C. $940 \; MeV$

D. $223 \; MeV$

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37#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

When a positronium atom (elecaic:g;zl.rfe pb 1+(dtron + positron) decays, it emits two photons. What are the energies of the pho+l1zrpbf c g;(.: adeitons?

A. 0.511 MeV and 1.022 MeV

B. 0.225 MeV and 0.285 MeV

C. 0.256 MeV and 0.256 MeV

D. 0.511 MeV and 0.511 MeV

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38#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The pe meson has a mass of 264 timed,pd3jywi;:y0 ibq2+ el;y xg s that of an electron. What is the range of the force mediated l j+2:;dy0xyeqgid3b ,w; ypiby this particle?

A. $1.5 \times 10^{-10} \; m$

B. $1.5 \times 10^{-12} \; m$

C. $1.5 \times 10^{-14} \; m$

D. $1.5 \times 10^{-15} \; m$

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39#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Calculate the range of a hypothetical force with the proton as the virtual excdtoz5;m9- onlcw ,q6khange parti5zq kc 9-wn do,t6;lmocle.

A. $6.7 \times 10^{-25} \; m$

B. $2.1 \times 10^{-16} \; m$

C. $1.5 \times 10^{-15} \; m$

D. $6.0 \times 10^{-8} \; m$

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40#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Identify the missing particle in the folm,:fbwd*c-v u( by 7jqlowing reaction.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

A. $p$

B. $n$

C. $e$

D. $\nu_{\mu}$

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41#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Identify the missing particle in d3po h)j (.irdthe following reaction. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

A. $p$

B. $n$

C. $e$

D. $\nu_{\mu}$

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42#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

Identify the missing particle ic : 3u) )::srretw.f) hcvqkvxn the following reaction. $\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ?

A. $p$

B. $n$

C. $\pi^{\circ}$

D. $\nu_{\mu}$

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43#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

The number of quarks in a ne2 0qnhs2r d;deuteron ($^2 H$) is

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:

总分:43分及格:25.8分时间:不限时

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当前第题，此次习题练习共有 43 道题

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