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

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?作业考试练习?国际高中通用物理?Physics Unit32: Elementary Particles

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习题练习：Physics Unit32: Elementary Particles

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作者: physics 发布日期: 2023-05-02 09:40 总分: 43分得分: _____________

答题人: 游客未登录开始时间: 23年05月02日 09:40 切换到: 整卷模式

1#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

What happens to the cyclotron f ;a h8uupecr+ n)o;9gfrequency of a charged particle if its speed doubles?f;pr)e uc+h8noug ;a 9

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 cyclotr) il/nltev -fzgnd+t.i;;w1e*;bfn*an4o vion frequency of a charged particle if the radius of its path;l4- ;n*evne+fdin b tg. )t*/zia1;nli v fwo 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 other, interacting, aq wwqw 5oxv; -s.pvn++nd then leaving each other. What xv+wn pw;vq q.5s-w+o 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 s:+p7+-cpfs wsnhqw6b hows the weak 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 elevn:h4-e o)lre+)(3ugi: u w xi yy4pbpctron 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 85bn dhi1umzdu a5:.iexchange particle have on the range of the force it mediatd:a mu8iz.nd5 h1iu 5bes?

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 we fn dsle ,rf 8(h+(+:nae:mjldak 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 cov6f56y m 0i4bhmf 3 uliwh/((about 100 times as massive as a proton). This would lead one to expec(63m fmvhoh /w c4flbi i5u06yt 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 e6 rnxz p83mkcq:soy5c1+wy+ 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 travels at the speeds 3pw1hg hqwg2+rg9n.*1ml 7 ,cvtepf 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 odb l5q)u vwfv4+d number of electrons and positrons is that such a process4 vw5lu)qvfb + 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 permissiblehgd *a,oqkp;9? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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 dec:dvt wbk fn wd7h7/1e+ay 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 allo k) g:dlptk,;um0nrta.0/hqc zt5 8mywed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 exagxbn 8)v 2wb ie.o3p4umple 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 ofa cj ttv(n*c/6 z2nc/2rixm b*

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 examp7,q*ci y *pnwdkef.k)sju)( wle 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 examplk)i,y **nn o*lzkb3cof, zme: e 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 interact via thdfnmk*4c:t59 .*l88kbn c e 1ml dfipne weak nuclear force nt188l:kfdbnmm *954. k* efn cl cpdi(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 subgroups calle :6z5bixnv.b/ 6cn v bso;q6lbd

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 compositionr qvzy0v -i ufjh42:b7 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 e(90sih1tz(amg- cbris 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 antiq93t m4hz*aff0p0 s gmhuarks 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, the qu*ula ox 42)jgx )sj+.vgpw.o e abi-z3ark 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 is/eir c+twhj7)s7a i,6t;npch aa p 9t/

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 fg1) 8revve9yf undamental forces? ree8v)yvg 91f

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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 fbxq2)u vjzf do-wns 0554uo4c orces of nature was the discovery that two of the so-called fundamental forces were two parts of a single forcewo5u2z4) f5o u 40 -dxqbcjsnv. 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 unjj2lwhhcr2 t:xl.a 20ify three of the four forces of nature. Which for:a0jcr2wxhj l2 lt .h2ce 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 fo6l:v0 /pl ssar f31wjdr 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 1l;v9 zfnya;1xu6 smm1hc8 xe 30 MHz. What magnetic field is needed to accelerate protonmc6zun yx;sv11m83l e9hax;f s?

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.pqktx:26 jc0f+3v+8aquihk:7v*5xd a vqwos 7-T magnetic field. What is the frequency for the aa+0pjifx3thvq 8 *w7akdv s: v:cq2xqko+u6 5pplied 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 field. Wh v*8q qn:izop v3hth:5at is the *iq 5p ::h3 tohvvnz8qkinetic 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 bu*0,ab 5 ress vkh:;uzpt approximately twice the proton mass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75 cm at a frequency of 8.0 Mhz. What magnetic fielksr*; vbhae:50z,ps u d 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 m,y .3vzj++f/si6;ji d vlr bv, fzslfgj7+2 ztry to create a proton-antiproton pair by annihilation of a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. What energy photon would be revij,gf.m v s+z+fjz+brs;il2fj3ly7 d , /zv6quired?

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) decays, it emits two photo6sa+ tgr3 jtfox m)/6ins. What are the energies of the photons? mx6ts6fg o/ a+r3itj)

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 the ra*yhg;i(dllyr og) 93knge of the force mediai(ld;y9hry gg3 o* )lkted by this 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 exchal9 e.1id8mhru nge parth 8m9e1ur .dliicle.

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 reaction.1 . qe43p pqpmns9-7jsc,)x vxc: cvfs
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

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 following(kmsrytd90 k / 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 parto3njt gt ic6qte8.2vy5ts.o 3icle 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 yos 3lr1m8ngr;d+:x din a deuteron ($^2 H$) is

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总分:43分及格:25.8分时间:不限时

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当前第题，此次习题练习共有 43 道题

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