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

1#

What happens to the cyclotron frequency of a charge1 w ol,i+wc/bzd particle if its speed doubl /1c,ww iobz+les?

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 charged particle if the radih bjx(*.xu3y;h )hwh8f ni uj08fucs1us of its path doubles?w8sx(0x* fb1 n.h8cif uujhj )3yu ;hh

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 sh. 5d*xwc dg4xeows two electrons approaching each other, interacting, and then leaving each ot.g c exdx4*dw5her. 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 showt2f vog8ly-80xfh yb)s the 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 electron i,g jzk-,hy 4,s.cxcyhs

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 e.ijn(i0g wd ok4y.a b+xchange particle have on the range ofo(i4a.ni. bwjg+y0kd 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 the weak force isvv1 qp a9w6;aw 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 100 times as9zy:xjwt l*boz3p5oxw 8zbv )06 kk, h massive as a proton). This would lead one to expect that the w8 :kz50lxb)*x pbhwjz v,6 z9oko3w yteak 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 callefzo5rdx /-o(i d

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 speed of li1hee s6t9n/xmp -4hk u/rsku q9n) xi3ght

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 cr*owys0xuub )u6-w x f)eate an odd number of electrons and positrons is that such a process wouldws0u x)o-b fuywx6)*u

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 permissiblel423hn8f rfmj ? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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 allo)24zzvpc3j) ga:*lwkxoeir 5 wed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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 1d(jyibmd+e gzx i7mr:*o92 r? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 (bh/ l9; bvsn /hty:hwof

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 of sequy03;z- kt

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 exam.v 9 mgtq9qolqw gw-x; 9.on;r0raa.c ple 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 u+cght08xu q;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 sa, lj*aue;rc 3trong force but do interact via the weak nuclear force (and presumably by the much weaker graviterc;j la3,a*uation 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 subgroup n* ;cj,*n5ic*dwrne ns 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 compojqfe4 c/f* l1e 2ho)bw+g*pp gh.zpc 8sition 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 t( 0 0; qgnxiswm9xty+jmt5:mfhat 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 quta sa6wzq6 ra)5uc 6g.8*uc-j 1xmuvjarks and 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 abmy enor4zn 2kbxf6nlyx+ s24 0j- t1n*sorbs a gluon, the 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 quar frlhx) (t4l(aks 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 8gr l mf:fh72zjq.*wqnot considered to be one of the four fundamental forces?*8 zjfhl qg7fmq .:wr2

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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 "8e:gzrjf ptfrd dv2.:u5 gf 8(unifying" the forces of nature was the discovery that two of the so-called fundamental forces were two parts of a singleurfd t:8rfgf5d v2.z :(ejpg8 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 thxf k2jq ;-dg2fxp+3ji eory (GUT) is a sought-after model that would unify three of the four forces of nature.3-x fqif2x;g jpj2d k+ Which force is the one 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 beails: kd)jt)aa:zf -p2m 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 10 - ni- 8kh1z8v lmicp6)3ljhrjg/(oyx MHz. What magnetic field is needed to accelerate prot8 i / )hjn(gkiv3ry1-8p -hocmx jlzl6ons?

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 prolalksa2z f,y24w 7 /ad plk,7gtons in a 1.7-T magnetic field. What is the frequency for the applied alsdya7gafkaw 7l,kl,4l2z p 2/ ternating 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 protons in a 1.g fdnk xpj o3-hovtvx5 :0;+3j7-T magnetic field. What is the kinetic energy of the protons when they leave the cyclotrojtxg 3-doo:3;vh0k n +jxfp5vn?

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 charix(rez*jz z+ qqhh2bk gn*w;pn5- y du,63u4wge as a proton but approximately twice the proton mass. Suppose deuterons are being acce+q-4 bj3 uiu,k *x;g(znhpz *2hywrw5zqnd e6lerated 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 a proton-antiproton -kqm,li p/58lxwft9 r0q0qo czj/ 7y qpair by annihilation of a very high energy photon. The proton and the anti-proton have the same mxrl/0 ot yikjlqcmz8qwf q ,0-p7/5q9asses, 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 (electron + positron) dec 2jnoecfo.*q5tu, r 2kays, it emits two photons. What are the energies of th*q22t jource5. n,f koe 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 thaaq.1onfonk;h0 um/sh.z4j 09y o8ocl t of an electron. What is the range of the force mediated byuc.hho9zn/j o1y8ql o. 0o0;ms4ank f 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 hk t pwawm)yhx01gc*cgc; pb(fd ,4/9dypothetical force with the proton as the virtual exchange p(t cp0/cy,g9;1adfwbw dmch p)x*4 kgarticle.

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 reac.f+t +32zz8aovli ,qs/ bsy (smq zf,ation.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

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 missingvb+w7lxzl / 0 ; k)3mnjmrink+ particle 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 particle in the foll lw zawkqai,wr m0a)h/,p5m2.k* w i1gowing 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 deut h;cwflq1,g/ tl0al4b q6x 6xleron ($^2 H$) is

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