Physics Unit32: Elementary Particles

1#

What happens to the cyclotron frequency of a charged tr1uun 0ww04oparticle if its speed doublo0n1u04wu w rtes?

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 cyclp3eh/knv*o1 td.72l x wd6ao votron frequency of a charged particle if the radius of its path doublea6. de2o w1* dh3po7klv tvx/ns?

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 su.r;hf s2g*a ohows two electrons approaching each other, interacting, and then lear.fhsg ao2*;uving each 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 interaw1:s1)whdbbb fs8vsu z+h*m5 ction 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 45arz8 z4rrb;qkb .ohelectron 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 ine)l z h4( ecpv*7ikp,zoql0h : the mass of the virtual exchange particle have on the rang4*qo,hpeipke(z07: hl ) zl cve of 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 is th 85)vo-co jx05wnelkme

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 fh g0lt6 g;v038wlqx ;t2ihdodorce are very massive (about 100 times as massive as a proton). This would lead one to expect that the weak for;d2hhw ttxql;oi06vgdl8 03gce 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 jm)ku1j;( u5u(8bpc3sg7ywtvf5 xihfor quarks 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 ligh: e9ruu)u nz8c sncs9-*r/ zbnt

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 e+1c;fqr ma6cl2zf3 fq lectrons and positrons is that such ff+mrq6 qa;l32cf1cza 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 permissible?,a5 *id5m)n 6f: qcw dq(aubby $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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 allowed? zlmq t.y- oh 4a)5-mpo$\Sigma^+ \rightarrow p \;+\; \pi^+$

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 deca4wr3fgnpz,d sz 5 )ube-e 5we8y allowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 exampl rks3lb+p;wl7e 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 exampl5yayq,f0 i nes*km (yfi)0 8vee 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 of7:t ay rf2x(wwrpa )k4

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 ohrta56py tsk 3m1 0s7sf

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 :tre05.:z lyjm gx k5z d3)rh yauc5,pinteract via the strong force but do interact via the weak nuclear force (and presumably by the much weaker gcp k tgmz ay3dy)u,0j5 l:zx:r 5hr5.eravitation 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 into523p zhs qck6n two subgroups 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 ofta d7cr1/fbss 125nmi 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 uh0jj/;d/yz g+ t mq-n/eis/vof quarks is 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 quarkr0) lyt8b3uksn x.d0 z77 wmfps 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 absorbs a gluon, the quark changd6bugp huz+ -0es

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 n)geq5. tzdg;1cn6a lf 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 one of the four fundamentak 8i eeou/** 8pkcw;sp9.nahyl forces?pw;ek8a.ueoc y/pk*8 *i 9hns

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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 dif ju8 z24xtu.zscovery that two of the so-called fuj8 z. zu2tuxf4ndamental 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)a: iodc 0:w8zes jo3p. is a sought-after model that would unify three of the four forces of n0edjoa ows:.p3: c8 izature. 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 1.4 GeV electronsi5) vdra--os pv96okf j 2d:di?

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 fiel bhhvf-mi2w+9ln hox(*pr6 kw4e0r3/2bi i fkd is needed to accelerate prot/(6ek 4ifwir+*ph9fwo20m3b nr-khxblih2v ons?

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 accelera;6(fudan6 uiqt * pxl.tes protons in a 1.7-T magnetic field. What is the frequency for the applied alternad ;6uplanit 6*xu( fq.ting 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 1.7mx*.hppot+l 54( its6pze r-l-T magnetic field. What is (p6 ph*se4itz5x +olmlp-.tr the kinetic energy 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 chjq i7, o 3.z2qqk*vjz6 ug/dlbarge as a proton but approximately twice the proton mass. Suppose deuterons are being accelerated inl*,dzqz7o.u3q v 6qgbjik2j/ 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 pair*+1wkso vz( wh by annihilation of a very high energy photon. The proton and the anti-proton have the sao1 z+wk vhw(*sme 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 (electron + positron) decays, it emits t9hhgf (5x6jepahqr. ( wo photons. What are the energi.r59fq(xphj(6 ha ghees 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 2jeyu g:h1, gb)64 times that of an electron. What is the range of g :b)ge1h,j uythe force mediated 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 wittt +3df oxx2,oh the proton as the virtual exchantd x3+t ox,2foge particle.

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 folr7ahfwnp1 c7, lowing 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 in the following reat.*b0o vu2 o1 hsy6) gkwtibj7ction. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

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 th 7(ni +8gjzaon.hw+ rne 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 in a deute apy qsq54h78nron ($^2 H$) is

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