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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 ch h5rx t-2hn+niarged particle if its speed doublrit -hnn52h+xes?

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 o*4r0yf 6czb9t 4eo jxff a charged particle if the radius of its path doubleszre9jt6oy4c*bx f f4 0?

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 approaching eacd7 w6rdyd+b o;h other, interacting, and then leaving each other. What particle is being exchanged during the intey6w;dbod+ rd7raction?

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 weakw tru5),r;u. o4.ysufx/xeop : abac7 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 electron1b(kvdyia30jv f wfr* k15 ;lqrurzol1s b;5/ 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 virtq -z yg+x0 1lhhw3+zzhual exchange particle have on the range of the g103xzh+ -lhyhqwzz+ 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 the w10fk9w .n3 egzn7fjrd r .nca+eak 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 t4kfhtmkd wicr2*)/ b*mmn. . the weak force are very massive (about 100 times as massive as awmin* .4b*td/)k chmm2ktf.r proton). This would lead 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 for quarks is callegu z obyoo,ryue9e3j 8x0/d*a:52p s jd

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 the sp dg4* u7t;mqv8 mkxe0aeed 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 co74bveaa re:9d uld not create an odd number of electrons and positrons is that such a process wouldrbee9dv7: aa4

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 d7e9 q5b cuso5permissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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 a tt8iv42tjtx) llowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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 allowedbn1eq+a zwg q;ro glx2o:x9w 5a+xu+4? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 examp4whwf aerhoph05l v8s z6c) .js60s, ole of

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 exampl5+wu fki2alg 2e 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 example om txix4*n6p: 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 exampl m9p9 vn n,a9i5k+vasq xch1/nktxk9 ,e 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 tjqh; kk qty*e2mj60gr 4z+b*ob0zx6g he strong force but do interact via the weak nuclear force (and presumably by the much weaker gravitation force) are call zeg* zby+jtg 0o;b6kj q4xrh*06qk2med

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 subgroup iqfpj9+ f69tps 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 compi.53div9gs*e)prxtmv ) tr 2yosition 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 quarks is thaw/le8+8ta 8uoepw +x tt 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 antiquarks icscr8p o+kf 41s

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, the quarkm 3 .un:znhme7 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 o)(z+ ihu 0kse7vzd;szf 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 consi02as o/de2jwmdered to be one of the four fundamental forces?esmwo0 /2jd2a

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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 "unifye p .sgwtpxw.2 lbm175ing" the forces of nature was the discovery that two of the so-called fundamental forces were two parts of 5psx1b2 7 g p.t.welwma 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 theory (GUT) is a sought-after model tce:wyy vb f/ 828lu)abhat would unify three of the four forces of nature. Which force is the ov/wafy b)l288 ucyb:ene 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 kqo+. srcx ;sir2)+xmfor a beam 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 1v;a6 :o4qer 1y0mpnc1.2sritih +ate0 MHz. What magnetic field is needed to accelerate prottc;yviar0e+:oh4m1i ernq p1s6. at 2ons?

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 pro:r6wue6vkyo (v fq3 * ,(whpzoymdr.8tons in a 1.7-T magnetic field. What is the frequency r yyuhdoweqf. mow(k* (:6 rpv3v8z6,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 accelerates , )m;m.avl) li3yq* the4j pylprotons in a 1.7-T magnetic field. What is the kinetic energy of the protons when they leavpq*m.,lmay3i 4tv;eyll) j)h e 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 cs 3nfxpf,q*t89j o1/q / clbsdharge as a proton but approximately twice the proton mass. Suppose deuterons are being accelerated in a cyclotron in an o*fqp/scsb/xdqt jfl,n391 o8rbit 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 a proton-antiproton pair by annihilation of a 1 blzm+/tlcu(very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. What energy photon would be required?u l z(+lm1c/tb

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 + positron38h:ze,) iotf i4 zngg) decays, it emits two photons. What nf i ),zg8 zhgt3eo4:iare the energies of 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 zgyq m poy7,4,fs(ibs gox3;4that of an electron. What is the range of the force medi, p3g,(y qb4xosf;7i4og myszated by 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 lkp gomu9spy/a(5o.m) 6 ki/y i(b:fw proton as the virtual exchange particl.km5okyu/f)s o /ppai6:il9wb y(gm(e.

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 fom*nybx0gf: c uhac4vh n3+oz4*6pu0i llowing 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 in920 0aj0 hdyvfl(pprnq 3dd-q 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 kfydd r4m+wy; 9vfm*.particle 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 *ybzzr7z 4 vb e.hr+m+in a 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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