Physics Unit32: Elementary Particles

1#

What happens to the cyclotron frequenxss;j0rka( 4 bcy of a charged particle if its speed doubles?4x(s bas;rkj0

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 cyclofa5r(fo -ps, ytron frequency of a charged particle if the radius of iof,-a fs r5(pyts 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 shol n)uy ac62b,d b *q(wq*b 2g.q ,w/otjeoc/fmws two electrons approaching each other, interacting, and then leaving each other. What particle is bein/2tw 6b bbyc,,2qae (glmqf w.nq)oo c*uj*/dg 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 bawx8zq: d -,kqz57( bzi ibn 2pl5)osweak 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 eunlpmt15,4n.h 8y 2b1t gd4pvyhcf) olectron 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 tqjfm1cvw1 ,i:qzbmt x, + 9uo+he mass of the virtual exchange particle have on the range of the +mitwqf:q,x +b cu1 91vmojz ,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 forcy*xjc-lnuy- nv+ p :,h 4tlkr)e 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 (aboqkmx2- gp9u o(- f7n mq 9o:k+wyo8elnut 100 times as mm g7 9ouox:2qmo-fqpn kkne8 +-yl9(wassive as a proton). This 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 particlete(5*: tbmmu )ev3mbj for 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 travelsd)on+1a wi :g1p 3vss,gpjc*g 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 nu v+f2.eilrht:6iwdm xw p+/a*mber of electrons and positrons is that such a process wrvw eap ii*2+.wxm +f6t:/hdlould

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 vu 3l*al2*ztgpermissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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 decaq2 m.skngk2lly jc68;y 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 e97t g s7h5lo0n7xirc 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 example .e+ jj;0mypv 1hzgbm ;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 2cr q.cwa.gwbxj) /n d r3p0r;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 exammzyiil74 ype ock/ld8,-u7-kple 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 exampwt7x4a q at3s.aj( g 7vn8wvgvh6mt:1le 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 interactx6m ig 5780ocd0sxsze+lq) 7khhz wn4hq* i.r via the weak nuclear fosqc zq4*h77ixg l 0 0 z5msknohh)d ewxr8i6+.rce (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 s(9s8v p locxemgszoc5 v.e020ubgroups 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 com61h u 8(6 yzm*idoprfgr:y lv0position 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 tw3:iygu1uq) +r3ybzrurr l u-w:3 t.what 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 antib /ltlhbo4 cro a xlcxa7 :0lialf+ pm57/19o)quarks 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 absoyqhe gt4, 7l(5rqdf*6he4nf t rbs 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 11jr l .b)8htzz uqo)jof 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 fundame :iizi6)e*zpsyv*p6t ntal forces6yipie*z* pz stiv6: )?

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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 "unifxb3fw/nr 9w0jying" the forces of nature was the discovery that two of the so3rf/w9bx0w nj -called fundamental 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 thh e5jt 5qbwnk5j59n7wmtj *+bree of the four fonb* 5mqnt5h +tj59web7kw jj5 rces of 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 ae8 (iyi+qh9 fjly1 vgms6m.,z 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 prw(m)f)fog+g) hg* 10 xylxz4s0bt cdnot)0+xoxnfl*1(fg4 d0zcmsgy)hbg t w ) 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 accelerates protons in a x fgzxtve q mmk:3;,,ux(t(+u1.7-T magnetic field. What is the frequencyzx3x,(mfgk, ue:(t ;uvtq+xm for 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 radius 0.25 m accelerates pi(fdqse/( 7)qevwww6rotons in a 1.7-T magnetic field. What is the kinetic energy of the protons when they leave the cyclotrond es 67qw w)fq/v(ew(i?

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 bu /zcquh nl3)o2g9u; mpt approximately twice the proton mass. Suppose deuterons are being acceu op;zl2uc9nqg3 /hm)lerated 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 prs-pn5 f6pkr tz2igw(m) h :.twoton-antiproton pair by annihilation of a very high energy photon. The proton and the anti-proton have the same masses, but opposite charp5srgpmtif6) .2zhwn-t w:k(ges. 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 at6c g44 nl,;j5*mr2g +crlfe kl8gyjrrom (electron + positron) decays, it emits two photons. What are the cycl8 5,6jrggrr2 4n+gfr 4lelj; m *kenergies 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 26q;up0j v9 8xvet;g4khw lgj b0.*u )tt4 times that of an electron. What is the range of the force mediated by this parbpl utjqtjg t ;0.4k 8;vw9vu0hx eg*)ticle?

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 arkbrzr7vn 9 7) hypothetical force with the proton as the virtual exchang7bnr k7 rvz)r9e 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 follo:ifio6uti( ah3* n ;fdwing 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 fossg-9e:q f :jyllowing 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 in8f,prmt3w zzu )y cp nm4+5+jw the 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 deuterox*1+/ismr0566c mdlfa e wre4s4 gq c deg)7ibn ($^2 H$) is

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