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

1#

What happens to the cyclotron frequency of a charged particle if its speed d+lsugx +8dueq 1g0 ib ()kfaue1zt:s 7ouble usg :k ug7suxa8dz +)e(f1 +qi0tbl1es?

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 cyclojh 1b od*r j4svyx0huj 8,,hct-7 wsl9tron frequency of a charged particle if the radius of its path doh v-,8oj,x9 h 4s1y0 wlh*bdjsjc r7tuubles?

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 approachin)xho y*qvz68/ 7n zv,wq)amud92dhh-6ol ixj g each other, interacting, and then leaving each other. What particle is being exchanged during 68w9oxhi)muz7-qh/jd zny lh)dv6* aoq v x 2,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 wex:sm5f j;h6jxak 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 easvy(( xi5j qxv40- rclectron 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 bf*wge(m.vagh i6cdi v8ph.m vkj :86fk5 l26increase in the mass of the virtual exchange particle have on the range of the force it mediaapw v5 l6v*2h: 8j cg6f.i8b.vhm kfgd(ki 6metes?

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 7m u;u+s:j extthe 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 (about 100 times bdxh0+l mujh ,:x 5zax ;qk c;vk6+oa;as massive as a proton). This would lex; +kxldvxoum h0ahk;6 q+c, a:5jzb;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 for (xqn ghdy9xql 5.*,doquarks 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 travels at the speed of e np0u5+jrk( sv7 bq+hvx 41hylight

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 of electrons and positron 3l0u bg -y5jswavdc9549uhyss is that such a proceu va0yc3gu l-5wh599sds yj4 bss 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 permissible? x pmf*z,istk5n 7pv(ud2o6w- $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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 dec tch8*+ 65o qhf5zgc(qz5marmay 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 allofcob)66*lay cmvd0k3fyf 4 l20c v9atwed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 examb*a4q8r:z(gosc ann, ple 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 exampmb6 /cee2l w:nod. uz3le 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 ofbc7 r6.z 2ysaf

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 *z cftq qvt.,l7;v4p 8b)ai spof

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 do interact vixx 8vs9,lyb-ea the weak nuclear force (and presumably by the mucex,y-89xlv sbh 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 s uk 2qf);gb4 eto+ qw9ls4rx;xubgroups 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 composp;isxi3 1cq*aition 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 iv f nmuy5v+vdj1nal n7-u4*q7s 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 antixje:u 6.de3lht 6n2r * o3mhws ri*k7f1i8ncpquarks 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 absdvr0-;t2 fw 7 vz:6ujk+g mjkqorbs 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: ld othxorjzmoy3(c:*8p+4 q 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 5karr1b4 ) lauone of the four fundamental forcesl)kr a 4u51rba?

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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 natu;5h4prje cea 6re was the discovery that two of the so-called f jhr4ace6 pe5;undamental 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 theory (GUT) is a sought-after model that would unify thr)s ,sdql.-ff2rkt ) opee of the four forces of2 sork)d- fq.,p) stlf nature. 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 beam of 121kehw 1z. s*m0kr :r agkru*n.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 MHz. What mab4isi. hfux vjuql1 c9f),,8xgnetic field is needed to accelerate protons?uc8i9bv1,xuf),f .jxs lh i4q

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 acceleratesgj7cs08e r (6dx8tfxsjm 5q3 y protons in a 1.7-T magnetic field. What is the frequency f(g8ed5m 0q t3jcrxj8fs y 7s6xor 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 radius5a / z qnpq4o5skjh92r 0.25 m accelerates protons in a 1.7-T magnetic field. What is the kinetic energy of the protons when they leave the cyclot/an5r4jpqkq h25sz9oron?

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 the6 / 8inioch pa4gogh5, proton mass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75 cm at 86h/gpo5nig a,ico 4h 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 by9mu2uck 3z ;dl annihilation of a very high energy photon. The proton alz ud2kmu;3c9 nd 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 (electkw 6dh,q(jk, q6yp60o xbf4 qlron + positron) decays, it emits two photons. What are the energies of theoqflph kdqy(6,04wx,66 bkqj 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 of an electrwir 86e /0zk rjq/+x b0+ c2)wvtypttwon. What is the range of the force mediated by twq tv+rkepz 86wxtir2y c0 +j0//w)tbhis 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 exo8d2 e,e ka.l 5hqjz8yih0z2mchange aeejdq 88lzm o0k,22 yhhzi.5particle.

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 reactionvof3 xeffwag07j8kij2 8h /3g.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

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 the following reacv:wq5ui3bt h4tion. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

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 followingam+mzi z omb:v(m7v2z)4 ajy+ 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 deuteron o+xz0be mr6r). mn0(ym;t*tbyg;txs($^2 H$) is

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