Physics Unit32: Elementary Particles

1#

What happens to the cyclotron4)m4 rmzten+x frequency of a charged particle if its speed doublemnmr x)+etz 44s?

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 c 565mi j:i /brglce5v5fyc b:ayclotron frequency of a charged particle if the radius of its para/c55yic5:5lbme ibj: g f6 vth 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 q: r7hrj ilv33(p:qwhtwo electrons approaching each other, interacting, and then leaving each other.iqjv3q w:lhhrp:r3 7( 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 interacgy7j 2+;g swy dnvgtk49 4a/emtion 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 elc;*k t7ddex )t+3npulectron 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 md tok4+x47 o1+qmkwexass of the virtual exchange particle have on1+4 oxd 4xkmktwe+7 oq the range 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 f r6t1eg-gka, dor the 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 massi9pkd5 u:(ulx0w vw;pxve (about 100 times as massive as a proton). This would lead one to exk:wu0 ;(upvp5 w9dxxlpect 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 ca(3iwpr5(qc:ita 2g *m ouyvi4 lled

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 spy 1c) ;;j.lb m;c(lgkbs(vl cpeed 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 electoxh)qu,bnx) 2rons and positrons is that such a process woq ))b2nhxo ,uxuld

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 permissibll 4di1 8uli2 2lworw)ae?

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 alr-gyk u 3hk;7ilowed?

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 u8;ffm g9s/th allowed?

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 examplekq7u.1vdklw 7 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 examp0kydzq t2cw+ 8le 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 n 7:qk:ormr 6vob ;m wr)o)h0vul(-vt 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 exampoo i5rs wut91fi)mfb )ob hbt*3z70p4le 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 do inters og3m3mw:h jsnw*)q,act via the weak nuclear force (and presumably by the much weaker gravitation force) are cs jog:q3h m3w mn,w*)salled

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 t 0ke*:kuan0/*nrtj2 )mu hym uwo 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 compos vb +khuzv y-ugyn1k 9+n4t6o)ition 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 featurqv)s 8 kwt)p)dr( xt*we of 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 quarks and antiquarks isio ne3v hzqzfua2sgkw.o+g-q+ :3s 09

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 gluo:e n 36qkhw8ik1r o/ney;gh+bn, 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 )ybb *yyval i1l0hp/ *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 fun x1zwu.s3jxxao,lz1 77w5m vrdamental forces?vxzzr.a1 xuwsx,5o 7mj 7lw31

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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 discovery that fvy3bageb+4/ two of the so-called fundamental forces were two parts of a single force. The two forva b+geyfb4 /3ces 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) ivj 41zd, v0sejjwvzdgj3*1u9 s a sought-after model that would unify three of the four forces of nature. Which force isjdvuzdw1g4v*03zj9 se j1v ,j 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 1.4pvy0p7et9k5 cfqk *dj j -r24v/5ar cf 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 acrik;vq;s7v5*sam4 75 x mfsseivh ,i/celerate proif4*ss mai7s;q r;7x5khv5 v /sevi ,mtons?

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 0.25lhy,: z8qmad3fak7: w m accelerates protons in a 1.7-T magnetic field. What is the frequenckqma 3 wa:, dy8z:7hlfy for the applied alternating 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 accel05hmev7c t8 kzci7 an/( 7ikpkerates protons in a 1.7-T magnetic field. What is the kinetic energy of the protons whp5n ckihz7/0kvcem7 7k(t 8iaen 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 twice bhwt14)hlrf ;the proton mass. Suppose deuterons are being accelerated in a cyclotron in an or)frh1bh t4;lwbit 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 by annihilation o ,4 g) jli72zt 0ey7xu+aycyonf a very high energy photon. The proton and the anti-proton have the s l0 yzo24 e7yx,gij tncu7+a)yame masses, but opposite charges. 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 + posi106tyayt1u 0zy gm:hgtron) decays, it emits two photons. What are the energies of t1gay0h6g0tz y ym 1tu:he 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 2oy : +ch9 +lp2tusa9/ouhkgpfe m*b3564 times that of an electron. What is the range of the fo ouych3g f*:muphb+9+5ps9ae l 2 o/tkrce mediated by this particle?

A.