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

1#

What happens to the cyclotronp,8 ndhbh 9s: ra*govtg494ag frequency of a charged particle if its speed doubles?vs9g 4tghrdg*,ho:n4 a9 b8p a

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 f,yimplhv2/v-: a jti5requency of a charged particle if the radius of its path doublpj,/yva mh ti:v25i-l es?

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 eb4vucm.c5wu4g)geon s*; :j jach other, interacting, and then leaving each other. v )bo 44g5.u*ceu;c jsmgn :jwWhat 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 neutrix3 wcw+ vx) h71e/xgcxno ($\nu$) 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 elep jsgq 67wic*w*eh;sl1s8fps /7xcb)ctron 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 mass7c * jmd( ,htntsb qya:(4w5 gp,y*djk of the virtual exchange particle have on the range of the forcc,5t7tyyn :*4(a,( *kp sdqwjdghbjme 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 is th,w/lg:ba uu)oe cv*n3/c:lg d e

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 13wld5 l(-6 zxinq8abpk mp; z500 times as massive as a proton). This would lead one to expect that the weak forc;5nb 5ll(w zikpp- 3qdam68xz e 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 callrdykb g lhb;2s lm9 ;g,wp)ull6af r,-0vh .w.ed

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 spee q/*ek gc3xhhglya j12,b(f6a d 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 of electronsv7j* , -lcw 7soveqx3u and positrons is that such a cq7jvxo37v u*lse- ,w process 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 permisvgej :)*-gjfc3;hbgx sible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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 alloo- 1ty+ovdn u3wed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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 allot-nke g)q*5qcz 0dc*rwed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 examplu f,t1gvb: d4re 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 example qnmot06ji -(/ :muxubf76ofw 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 examplet q1el6jev yf,8js3 s2 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 examplengt c0xi-wgo;4;-z5 qd+nu gr 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 strong force but doqb 5ty1 c ba+jyt 1/x6rqqh9l4 interact via the weak n/btbl1 tx6 5cq1ayjq 4yr+hq9uclear force (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 two subgroup kxle:x 5k0rim7;mr2js 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 compom8 63qhj* .hyd5+tfq hf x: u5a7rvicnck+fg /sition 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 tnp; exnfbu2/f lk;pgz, yb7,d62 n 5wthat 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 q hu 5uqp1.:+aq7kgiz 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 ,ks35g9i fisndlx30 mt u0wkoi.jc ; 3absorbs 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 o7dheh )roca su(hqv**0vw (+wch/h5ef 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 o0mu z1b4 ojd y,di;vvjli)6 1qne of the four fundamental forcesi0old1q uj v,4djybi6m); 1zv ?

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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 "unrgi3m;dvk ;0e ifying" the forces of nature was the discovery that two of the so-called fundamental forces were two parts of a single force. The two forces that were so unif;m0k i;evrd g3ied 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 (GUT4r5hpd(y x5vzm a67d jja2. ns) is a sought-after model that would unify three of the four forces of nature. Which force is the one it woujy6 a2mdahj5vd4 5xs7 r (z.pnld 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 1.4 GeV8zi:/ iz0z.g,ycr)nhva h9bb 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 magnetic field is needed to accelerate prhx2aa 6) ynv-poton) -6vyh naapx2s?

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 acceoe+h(m:z 8xwyb h6 ho v4g0+kxlerates protons in a 1.7-T magnetic field. What is the frequency for the applied alternating volt :(0hx h+x8+yz4mhge vokbw6 oage?

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. 6;-3qjr zcx8wip8 45 ;x0pu g6gscu) xjjmvmx7-T magnetic field. What is the kinetic energy of the protons when they leamxi6zgc;qj5 g3xmcupv p x048;) w6s -rxu8jj ve 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 approxieu2cb.l 9 me9trg,cv4mately twice the proton 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 celm2rcug99evtb, 4 .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 try toirefmr45:g):t s k;ro create a proton-antiproton pair by annihilation of a very high energy photon. The proton and the anti-proton have the same masses, but opporg5msoie:r;k f):r 4tsite 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 (electm-9jr -:w/l r x7pa;gbthnyq ,ron + positron) decays, it emits two photons. What arw g7j ythr- ;bxr/qam9pn,- l:e 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 that of an elm416yexcy6vifyy6z5 ectron. What is the range of the force mediated by this par 16z yfyyc54i x6eymv6ticle?

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 wio x. edcqn5sb7d.v93e ) gn;mg2kz)nk th the proton as the virtual exchange p2k mn3sgeq)e97 .d;ncnx 5b od.kz)gvarticle.

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 followi:;iaj yrqf14 uey(v/qng 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 pm6wzxht;s f)epr s-(, article 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( t8eko z jfe7/)iistc+-kp+x owing 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 deuteronjve.er 3f/d/1) qj zvo ($^2 H$) is

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