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

1#

What happens to the cyclotron frequency of a charged +vtv99 wkfkzr mrx(vi4ok0:4particle if its speed doubles? m:kfiz9w4v o09 4x+rkk(r tvv

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 frewg d+av(6tyhlo/, trb1xt l,7quency of a charged particle if the radius of its path doubles 7v, , dao( +tgw/tl16tyxlbhr?

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, intz.yq (,rdm fc 4qag5 pnh5z4+seracting, and then leaving each other. What particle is being exchanged during the interacti5zsq,(nf d + mcr4ph5qz4gy.aon?

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 interaction of a neutridw6i7kf n0ufr0e3) njpx- gb(no ($\nu$) 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 chargedv)uy*:p/b qo n 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 increaf vqw6-hoq* k*se in the mass of the virtual exchange particle have on the range of the force it mediatesk6f*vh q-wo *q?

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 tnk q;gv8/)y(+gey rpi he 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 massive (about 100 time6 gsx4u.fj5 -ajn ,y8f g7tbyds as mnf68x5-jd.gs4,ay b fju g7ytassive 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 particle for quuvf5 h lmd)w u(6a+fohuaf1-8 arks 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 a+xuf 3yq ix;h6t 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 electrons and peh60*7jc;gy *)hzx vijne*.h * fzbtdositrons is tha0f * g)d*i n*jcey;6*zzhhe7.bvxjtht such a 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 permissiblee:t m xb -p2jyw8 qt72, wezbx9duah,0? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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 deca wrb1sbz b7r ,72euey+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 allowe4gafph5 a 41;/elsynbd? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 pz ,6p.hy i5sjof

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 okgj // ym(nzy xwnuv2; -w0/kypyh2 b8f

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 oprk vrz,k:m:f9 rvv,, f

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 examp+w *trg9s*utm h c9/pzle 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 inf zql 7,m+tkh r+4pt3steract via the strong force but do interact via the weak nuclear force (and presumably by the much weaker gravitation force) are cal, hp4r7++lt3zftmskqled

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 subgrd u.8y -kdpj3.vf:4 tf0ry gpmoups 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 of nomp/0 ae)d4 w+ eoyu3a $\Lambda^{\circ}$?

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 g2- s0peaiek,d sil,vsbd/ .;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 antt qpm qw r9t;3ezo+j57iquarks 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 db/r*s d37zo. rd*bcb 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 qiu (8dd/u3y-mq cxe+xuarks 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 hb20euai+3fpi1j0/ upp te:vthe four fundamental forces?+b iu3e20jiv hu1tppfe p0/: a

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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 wast nquz.jtf 8 baej*t,e8l3ad;bb1aht f 0,t/8 the discovery that two of the so-called fundamental forces were two parts of a single force. The two forces that were so unifiedf,thze 8 ;faaed/.n,ult8 3t tjjtbaqb0 1*8b 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 sw*x 6gy: wa:p(GUT) is a sought-after model that would unify three of the four forces of nature. Wwax*6sw py:g: hich 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 electr2rr) fk.o x*5iagvl+hons?

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. Whatyd(5ge7/of k x magnetic field is needed to accelerate protons?g/okxy(f d 75e

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 fh2 qj e7l o/tfo+8 n5yg/hon:jield. What istj:n2 5n/qg8o7hl +/eo fjoyh the frequency 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 protons in b)1 2n1qge pmm*3sgs uk/s; me aqc(5dm.m-mra 1.7-T magnetic field. What is the kinetic enb2mn *m u1m.e d)s5s1;m es amqr( /pgcgqk3m-ergy 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 approximately twice the proton m-wv qp u2*p ,( 4fouy pft5n6nchp7rb;ass. Suppose deuterons are being accelerated in a cyclotron in an or *n nwcu4qp6py7( bpof ,5v;prth2-fubit 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 protofejs08sh4 wu)3gg 5 ez1:mnuon-antiproton pair by annihilation of a very high energy photon. The proton and the anm :fso8415sgj e3zhuw0e gu) nti-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 + *3o s11glfki ;s gq0( .ap.l1immegqspositron) decays, it emits two photons. What ar *s 3 gsim1fqpsgl11mg0 l;ae ikq(o..e the 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 mass7oa yih ok(8+z of 264 times that of an electron. What is the range of the force mediated by this particle?7(+8hiyooka z

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 3cww;rqx2s (9lw8ycjn 0 r+lethe proton as the virtual exchange s98cn ;l yr3 r+wcejwwq(02xl 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 aqw/hmn84 ;ol3;q6m9rukvbh particle in the following 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 pi;g 5 0ci ,s3qrxwbxa )qmsm7p 7icms9i)kw 2.article 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 particl/n 0d x6; oam5jgwt/mvc5dzf(e in 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 dzk o9)t xol(6:-93tfzisa ti qeuteron ($^2 H$) is

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