Physics Unit32: Elementary Particles

1#

What happens to the cyclotron frequency of a charged pars7+fx. z0 8/pcpp zl3opes vx/ticle if its speed doublpfvsx eso+plz.c/p37z8p/ x0es?

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 cyovzxv-zf93)g4 elz +sclotron frequency of a charged particle if the radius of itsvgfz9e xlv+os3- 4)zz path doubles?

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 each ot8 riqr38k ko+uz: ojac73bm(fher, interacting, and q of:r krzoic37kb 3mu8(ja+8then leaving 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 interacti0cns8)h q*m5mfe , ndfon of a neutrino (

ν

) 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 el1k:i mn;8 p2mbh wav2eectron 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 virtual exchange partic (tk2d 4ulmvr(le have on the rang vk2 dmrl(t4u(e 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 forpgz su46zu/s f8*.ixrce 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 weakprk7w4f pt7t 0 force are very massive (about 100 times as massive as a proton). This40ktf t pprw77 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 can0)doz5 8x1vkx en: gilled

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 trave 8gzyxd):ka:/ylqtp * ls at the speed 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 :t (hi.tq7sj(mfpmc 0electrons and positrons is that such a procesim(f7 .m 0htjs(tcp:qs 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 but 2 ,guu)+,sj:loiq?

Σ^{+} \to Λ^{\circ} + π^{+}

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 allowe7 ,1 k./hj.yqnoqate0t/ovsc d?

Σ^{+} \to p + π^{+}

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 13,kn 3db xfe,oxgo8 wi 1feu6allowed?

π^{\circ} \to μ^{+} + ν_{μ}

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 exa*o6vdp8zw sh/ mple 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 examplemm7y49je51s jj f2klw 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 yid3- k q0e5glof

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 of2 kjkwf)1 uzx9

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 st(vld 1dqc.b l:rong force but do interact via the weak nuclear force (and presumably by the much weaker grav.dcl l1b: (qdvitation 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 ino ,- l zblu7ve8fjm9apq8odql e--82sto 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)o4y0gm j)fs + +umy9z+jnxw x of a

Λ^{\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 o yaygx,7z t,93e/s wcfquy;/kf 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 quaj 7sdh+5jcqvox.n; ;z :nqu6urks 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,bvip+ /5dl( t+)n+ ffc r;qjfkdh6e7qe9qv9 g 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 k w-42l;vxsekqvbg ( 3 y)*zqaof 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 fundamental )fydmx.jc .l 61sc n*pforcen ).yxsjc dlc p6f1.m*s?

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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 dc:pilt,ry h:)n9/(tn)z- ig b ;a nzo-c4fdwciscovery that two of the so-called fundamental forces were two parts of a single force. The two forces that were ,)9pncyc:wi-): a l4rngh b-z oc /ntz;fidt(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 theorh -;-)ti*r sobws7zrzy (GUT) is a sought-after model that would unify three of the four forces of nature. Which force is the one s 7sw-;*tzrohib-z) rit 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 wavelengtwsseuefb3y(8n59 l i5mdx+t *h for 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 10 MHz. What magnetic field is needed to accelerate pr ocymww3o)o 3arpcw.xa 8-3 6aotonsc . ww6ao-38yo3pr xoamawc)3?

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 protons in a 1.7-T magnetic fieldfo,ylo64 di:m. What is the frequency for the applied alternad o4i,lo6:fmy ting voltage?

A.

0.26 M H z

B.

2.6 M H z

C.

26 M H z

D.

260 M H z

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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./bm ybbs)1f(*b4f edl7-T magnetic field. What is the ki es/bbml 4y(1bdf)b*fnetic energy of the protons when they leave the cyclotron?

A.

7.8 k e V

B.

8.7 k e V

C.

7.8 M e V

D.

8.7 M e V

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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 trkg*v wat-zz .ht6. ,uxz0l,bwice the proton mass. Suppvx h-abl utw zr,.g.kz t0*6,zose deuterons are being accelerated 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 pair byeha0;(+y hvkx: l;cuq annihilation of a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges.h; yuv(ak0 hc+;:qxle What energy photon would be required?

A.

1.022 M e V

B.

1880 M e V

C.

940 M e V

D.

223 M e V

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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 +b9k7;.mtwtwn j mr9, f positron) decays, it emits two photons. What are the energtmr jn9kwf;7, m9 .btwies 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 electron. What is tw ze1wxucoe54s752 d jhe range of the force mediated bu w57e4s 1d2ejcz5xowy this particle?

A.