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

1#

What happens to the cyclotron fr*a pg6d(rpn4l9la/jt +f 3o zsequency of a charged particle if its speed doublztg pnl(ldsoap*3+ /j a49 fr6es?

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 frequency of a charged particlbbxq+)l+( tj-/. ,7ojuiht6kwt+g uk mu p db1e if the radius of its path dobwh7q-+. 1, x+ ibtudbmtl+6u otu/ kpg )(kjjubles?

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 other, ,c2u, l6j6s 74(cfdgimivvkt interacting, and then leaving each other. What particle is 6(mkg, 4, vuid lsc6if7jc2vt 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 we; sds8ryb;l/coup 0/n pv1g i*ak 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 chargedthemwd (051 ;ic tv upzh:a+nuf8b c9: electron 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 ther+p j 3kqo*a g4g2h-lt mass of the virtual exchange particle have o kroa tj4 3gqglp-h2*+n 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 for the weak f (ah3t xx)pz 5xf;g6wqhw0 7 dxj)jqd;orce 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 particlesfw douyb5rh (q,8e +q( for the weak force are very massive (about 100 times as massive as a proton). This wouldqbyhwe8qo(d ru5, (+f 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 ik4(8ifav 8xy fs 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 lig)ob2ekbtv 3xst 7h g)7ht

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 electrons and positwmizf6 3 lba)8hp bw;6rons is that such a process woulfwbpmh 6;l)bzwa 68i3d

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 permis r ng* r0ux-udfy3fg*2sible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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 alzh:f3nwt1ktt ;2ezif /g5j6wlowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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 dec1fnlyj m0ivu t0:u,1xay 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 exan+)+;qtvfvia +fas;debz xd3 ( w6qh6mple 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 examplrudvio6b7ie4c 9m5 2qe 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.s7ic4ksidb3.i go x5 y+p qh8 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 example tl;b,s xa*h4 3sine eae cf/33t,c8lyof

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 ing:j6u, b qr6zz6 iti3lteract via the strong force but do interact via the weak nuclear force z blti 63u,qg rjz:i66(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 intxf5lm /. np8hkq31u-fi1laul+x2rk r o 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 1 hjh;-:cuk:dcgak-tof 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 that.1ye bvts 39jg 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 x+ jauz44 oh- y+cdbh *(8fqcqand 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 orts4kp.n7 b3bn absorbs 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 of quarks l2 ( oynk3kpps3d;e i;cx(nd/ 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 followingo;i/vyr4zjm) a14sge is not considered to be one of the four fundamental force4symroeig 4) /zav1;js?

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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 thg jpij3uson98z06 yc 2.e)3:x hq weixe discovery that two of the so-called fundamental forces were two parts of a single force.3zy3xpnieu:908 i cqej)ghowxj. s 62 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 t7je i*9 p w+v+bml6kgvhree of the four forces of natum7+9wvv jbl kg6i*p+ ere. 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 1idj 6f+7y(i (brjh uif:/p1 yp.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 nemsodr0eh(2 uc 4d5u h8eded to accelerate protonsd uheudmhc854o(r s02?

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 field. Wha55u3hfxnkiv g m 3rs-0 bx5ju(x8px6 xt is the frequency xx(xnsr g8ip- x53 k3mx056jufb 5uvhfor 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 protons in a 1.7-T magnetic fielo.afgt:h 4vhd8 ,4nl5a( tbxod. What itht:4f5aadl 4 xbvg onh,o8 (.s 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 charge as a proton but appr,aqhef: og,y( oximately twice the proton mass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75q: ofage(h,,y 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-antiproton4q 9yutrj (tt+ pair by annihilation of a very high energyq4t yu+tj r9t( photon. The proton and the anti-proton have the same 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) decay;3znd w9g3vdfs, it emits two photons. What are thedn3gzd93wfv ; 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 264.7g9o+ever l x times that of an electron. What is the range of the force mediated by t9x7ovge .re+l his 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 with the proton as the virtual exp/6o p;)mk5l mvwyc2ch.tx( qchange pa2mp.tk6ycq cv(x;o)h5w l p/mrticle.

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 following reactio dfg+x-7dlk ( nw2sh+vqon65yn.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

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 particlej.o2/6 sosh 9caq*skh 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 following reactizkoa.skm,h7 o gwvtq3:z yj1)6x j2e/ on. $\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ?

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 quarkskbfaw kq xjt-6ujk3x;00,/zg in a deuteron ($^2 H$) is

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