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?作业考试练习?通用国际物理?Physics Unit32: Elementary Particles

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习题练习：Physics Unit32: Elementary Particles

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作者: admin 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 particle if its speed dprky;yq.atjo7 8d/j9 oubles?q9oydtpjjrk;8 a .y7 /

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 cy*(o1+g0 ):z4 rozjp l1 jbrhyays ywc(clotron frequency of a charged particle if the radius of its pas*0z( (rc 1p hyowg)yljj4ao+bry :1zth doubles?

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 shows two electrons apprthvzp*5m .ev i ;vqclc g9-s44oaching each other, interacting, and then leaving each -z qh9te*vv;pv4imc5 sgcl4. other. What particle is 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 the weak interaction of a neutrinagpxu16q:5rgq g d.g 0o ($\nu$) 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 electron :x b2b nh+z2isis

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 exchgbgwf8 +)3sy9e waj )nange particle have on the range of the fo+8g a 3 )bjn)gswfyew9rce 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 the weakdj(.* iacml:c 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 (about /b/ fi1x0xzu0tlxch5 8.qwjj ,n1qq j 100 times as massive as a proton). This would lead one to expect that the weak forcewicjx t1uqnb5 xx0,1l8/ .fqz/jjqh 0 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 for quarks is call9:0bxdw yit y8 a.a3lg0 brq2qed

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 travels at *,un q zifc *+zg.7ab3htlj2dthe 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 number of99 1ljvib20gxo5 stph electrons and positrons is that such a pros01 tgo5hv9pl i2jxb 9cess 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 permiss bb; dcuai2 lx2z;1 a7clr.,df;gb( peible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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 decar e5u)oq 7kw5vw -z:bhy allowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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 allowed? wzv*)vl;l) oq $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 ofzd 9r ,f,mx8yd

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 example ofdz8h8;vtm)8siph 3 ei

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 example oxxo58x 7s q5hpf

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 examplk; ln-izx-8:x+ efpwre of

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 strsp p/h 3vjhs1:t s9e /(fh8ymbong force but do interact via the weak nuclear force (and presumably by thev/eb8 ps9fp: s 1m3y/ (sjthhh 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 two subg/u 1i) 9f)4rzwfdgew vroups 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 composition vp:kkae43y, g5 gmet- fdi h.g9+7y- 2 lqhmgfof 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 quarks fkg (/+9xqec1yu)r+ s q3jh wijiv;5+ami+ztis 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 an2,q4si:nrmb 1qovx vtg- oo7) 8)/5zju rysnb d antiquarks 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, t 7v (z1lkn3xzy1eho 2ehe 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 quarks i+ h j/v(yodjy;s

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 the four fundamental aa4)cn8xe7i b forces?8c)aa i4x 7bne

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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 "unifying" the forces of nature was the discow:- 6kwck:w l0rwj*clkz,9e9w yb ni4 very that two of te,nk*:-bkww j46w9zwc0 krwl9l yc:ihe so-called fundamental forces were two parts of a single force. 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 theou vaf4f0* lkmd qq+1y/ry (GUT) is a sought-after model that would unify three of the four forces of nature. Which force is the of ukdq +m1*va/0 lyqf4ne it would not include?

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 beppuzd++u yja7h.f5+eo.fk o0am of 1.4 GeV electrons?

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 1r+:zfuqp8m+p ;ynbn 56wso 5n0 MHz. What magnetic field is needed to accelerate protonsoyq;r:5 b68npnps5wzf+m+un ?

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 accelerates prwl0x tx0okgmf u529/e otons in a 1.7-T magnetic field. What is thx90fkxw/ gme u02tl5o e frequency 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 0.25 m acceleraterap gvxpcl-;gd( *0v0s protons in a 1.7-T magnetic field. What is the kinetic engvra;(0lp v-*pcxdg 0ergy 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 proton but approximately twice the proqj+e u.l8gee*ne:h 4c ton mass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75 cm at a frequency of 8.0 Mhz. What magneti+el ce:8*ej u4n gqeh.c 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 g:4h wj;c2+8qvi q pchtry to create a proton-antiproton pair by annihilation of a very high energy photon. The proton and the anti-proton have the same masses, but opposjvqwq48ci ;c: hpgh+2 ite 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 (electron + positron) decays, it emits two photons. Wep1bbvm6 j 6x.hat are the energies o pe j1vm6.xb6bf the photons?

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 times that *: kd**k worybf.bf9hof an electron. What is the range of the force mediated by this d**kfor.w b* byk9:hf 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 asva2r:/nnepejiej c3 sd0;1x3f p *.jz the virtual exchange particle.ce:jf;ei3j r0xsnvza3dpe1n *2j p /.

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 following reactio f 13/xk2dk qmb4hd:tzzeo+q- n.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

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 partick3: e p8:/dfvq*h dszao )-pnrle in the 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 parti6gi2u(h5 s vtzff6c o(cle in 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 q 86: en(w8uahp)8s vrq,cadm in a deuteron ($^2 H$) is

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