Physics Unit32: Elementary Particles

1#

What happens to the cyclotron frequency of a charged particle if its k9-hn t9-(tu7rm2 ow vuo,;jmu ws ,oqspeed doublmt-k-jh;79wqv,muourn(o29 t ,owus es? (1.0 分)

A. It triples.

B. It doubles.

C. It halves.

D. It does not change.

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2#

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What happens to the cyclotron frequency of a choxfjciu/1d/v; 7/ifurb 82m z arged particle if the radius of its pao vif8icf/zrdu bu/m jx /72;1th doubles? (1.0 分)

A. It triples.

B. It doubles.

C. It halves.

D. It does not change.

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3#

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The Feynman diagram shows two electrons approaching each other,c9fmz6 p i b8c1h-)ptf interacting, and then leaving each o96tcmcp1z)bi-fhpf 8 ther. What particle is being exchanged during the interaction?

(1.0 分)

A. pion

B. virtual photon

C. neutrino

D. $W$ particle

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4#

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The Feynman diagram shows tv pllck a; n;:z48 nkqs:j72q;)szgzw he 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?

(1.0 分)

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5#

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A positively charged iq hf(poo(b81i4 3 s jor,di3lelectron is (1.0 分)

A. called a proton.

B. called a positron.

C. also called an electron.

D. not found in nature.

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6#

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What effect does an increase in the mass ofesa vob8;f+sh 8 4:1rh* hyya qj-yk+-qlb bs. the virtual exchange particle have on the range of the -*vbfhy.l e1+-q hbsqjas;kob 8 sy4: 8rha+y force it mediates? (1.0 分)

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#

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An exchange particle for the weak force is-g, cz0eml4 08vrqlu idq2m)f the (1.0 分)

A. photon

B. meson

C. W particle

D. graviton

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8#

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The exchange particles foresk z -/as9t:z the weak force are very massive (about 100 times as massiz :k9s-s/aez tve as a proton). This would lead one to expect that the weak force would (1.0 分)

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#

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The exchange particle for quarks is callewzo it6:5e -bpoo-z,t d (1.0 分)

A. the stickon.

B. the gluon.

C. the epoxyon.

D. the epsilon.

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10#

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A particle that travg,h)(z,z swn79,i nqll rpgj8els at the speed of light (1.0 分)

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#

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One reason a photon could not create an odd number of electrons and pos;f9umtn 6g a6kitrons is that such a proka6tfg9 6;unm cess would (1.0 分)

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#

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Is the following decay perm c)gqrj+2t sttok 5.k:issible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$ (1.0 分)

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#

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Is the following decay9 4e w5xs ibg.p1v8(pussmby3 allowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$ (1.0 分)

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#

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Is the following decay all7r vv .vd)f3p0/s wwyqowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$ (1.0 分)

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#

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The neutrino has (1.0 分)

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#

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An electron is an exampl -2b 746acdq .mzmum/( tmpasne of (1.0 分)

A. a lepton.

B. a meson.

C. a baryon.

D. a gauge boson.

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17#

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A proton is an example of7 qo80bk8daj ai61x s(ybfa( irx*4ny (1.0 分)

A. a lepton.

B. a meson.

C. a baryon.

D. a gauge boson.

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18#

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A neutron is an examplec s (t6cu0q0dr of (1.0 分)

A. a lepton.

B. a meson.

C. a baryon.

D. a gauge boson.

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19#

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A photon is an examplexd8l 7 7zqp2br6(spory5ft( u of (1.0 分)

A. a lepton.

B. a meson.

C. a baryon.

D. a gauge boson.

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20#

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Particles that do not interact via the strong force but do interact via 2ciwvwv 2ap3b6 la 0xr)w wf673o /thvthe weak nuclear force (and presumably by the much weaker gravitation fw0a37wv3vtaph)i6 2oc2/lr b6ww vx force) are called (1.0 分)

A. gauge bosons.

B. leptons.

C. baryons.

D. mesons.

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21#

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Hadrons are divided into two subgroups caltcah+)d rt0,a led (1.0 分)

A. baryons and leptons.

B. leptons and mesons.

C. mesons and baryons.

D. nucleons and gauge bosons.

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22#

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A quark is (1.0 分)

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#

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What is the quark compositior5h( (t)) nxwvvots+ fn of a $\Lambda^{\circ}$? (1.0 分)

A. uud

B. uus

C. uds

D. uss

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24#

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A distinctive feature of quaank63 osxqip r*4w h(-rks is that they (1.0 分)

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#

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The charge of some quarx n.yuj*:d9-d;nszh a(o33 bm jff u.oks and antiquarks is (1.0 分)

A. e/4.

B. e/3.

C. e/2.

D. e.

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26#

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When a quark emits or absorbs a gluon, t5g c0 bt)5rg sh-u:hwthe quark changes (1.0 分)

A. its charge.

B. its mass.

C. its color.

D. into an antiquark.

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27#

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The number of types of quarks o/p7( hcys /ipis (1.0 分)

A. 2.

B. 3.

C. 6.

D. 8.

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28#

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Which of the following is not coqor afa2z70b8gcpe9 m/e6x6f nsidered to be one of the four fundamental forcesc0m 2ef9r8azqp ofe/ a x6gb67? (1.0 分)

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29#

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A significant step in "uno t,j *v so)+cz+/ldjsifying" the forces of nature was the discovery that two of the so-called fundamental forces were two parts of a single o o +d,v /ctsz+s)*ljjforce. The two forces that were so unified were (1.0 分)

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#

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The grand unified theory (GUT) is a sou;uckxew:+npp+6 dse55 fecjg3ssg- /ght-after model that would unify three of the four for5jk3:gdn;e+g + cpf6/s5e ws pu cse-xces of nature. Which force is the one it would not include? (1.0 分)

A. gravitational

B. strong

C. weak

D. electromagnetic

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31#

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What is the wavelength for a beam of 1.4 Gp/ 53 j;mzg* g:qi jw 42x5asjt:jckgqeV electrons? (1.0 分)

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#

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A cyclotron operates at 10 MHz. What magnetic field is neededwd; padre5w (,p s8bdzu46g/sxu0z(a to accelerate protons?e r58s6 (/a,wpgu xwdz4dspu b0 (dz;a (1.0 分)

A. $0.12 \; T$

B. $0.25 \; T$

C. $0.66 \; T$

D. $1.5 \; T$

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33#

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A cyclotron of radius 0.8m.9 xtdzh7 bch/15xgrbew1 z25 m accelerates protons in a 1.7-T magnetic field. What is the frequency for the applied alternating voltagehz819/bb1dhg 5rcwm.et zx7 x ? (1.0 分)

A. $0.26 \; MHz$

B. $2.6 \; MHz$

C. $26 \; MHz$

D. $260 \; MHz$

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34#

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A cyclotron of radius 0.25 m accelerates protons in a 1.7-T magneticrd d *bp*gacql+(3a :d field. What is the kinetic energy of the rq (:l* apcd ba3+dgd*protons when they leave the cyclotron? (1.0 分)

A. $7.8 \; keV$

B. $8.7 \; keV$

C. $7.8 \; MeV$

D. $8.7 \; MeV$

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35#

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A deuteron has the same charge as a proton but approximately twice the protovsg5lped pvw;-l .w)p -kn( e4n mass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75 cm at a frequency of 8.0 Mhz.vpw v;gn4l )edsl(p p5ewk.-- What magnetic field is needed? (1.0 分)

A. $0.011 \; T$

B. $0.11 \; T$

C. $1.1 \; T$

D. $11 \; T$

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36#

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Suppose you were to try to create a-bdz-n mo73p,q:r83 vpvdkgq proton-antiproton pair by annihilation of a very high energy photon. The proton and the ant-m3 3,n qv8zb:qpp-d vk7g dori-proton have the same masses, but opposite charges. What energy photon would be required? (1.0 分)

A. $1.022 \; MeV$

B. $1880 \; MeV$

C. $940 \; MeV$

D. $223 \; MeV$

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37#

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When a positronium atom (electron + positryc t6lik.-v5 kzz *(mwon) decays, it emits two photons. What are the ene.-v *cl5i6mzkz tkyw( rgies of the photons? (1.0 分)

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#

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The pe meson has a mass of 264 times that of an elecwx9 4 -mrar5 +.cshgmiq0 aak1tron. What is the range of the force mediated by this part rki-9xm4m arsah g5+w0q a.c1icle? (1.0 分)

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#

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Calculate the range of a hypothetical force with the proton as the virtual oq ld ohl-+ 1f76(qkscexchange part+fkqlo -( 6h71doc qslicle. (1.0 分)

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#

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Identify the missing parti6qh 9ni oz9ik0cle in the following reaction.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ? (1.0 分)

A. $p$

B. $n$

C. $e$

D. $\nu_{\mu}$

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41#

单选题搜藏此题

Identify the missing particle in the following reaction.*snf :zb+v rg9 fi/hq7 $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ? (1.0 分)

A. $p$

B. $n$

C. $e$

D. $\nu_{\mu}$

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教师可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力

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42#

单选题搜藏此题

Identify the missing particle nan2j; ,*ph o8wfkrj5in the following reaction. $\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ? (1.0 分)

A. $p$

B. $n$

C. $\pi^{\circ}$

D. $\nu_{\mu}$

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43#

单选题搜藏此题

The number of quarks in a deuteron g twrv+1b))b fct7ofja575om($^2 H$) is (1.0 分)

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