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

1#

What happens to the cyclotron frequency ofo )lor+g-d2xn a charged particle if its speed doubles?-or dn2 xlog)+

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 c6ck,tay c)z2cq.odv,i+9znm h n kb.9 yclotron frequency of a charged particle if the radius of its path dicv c)dkn6,+2b9k.t n.ocm9 a yq,hz zoubles?

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 a)r.s8 la/tra wpproaching each other, interacting, and then leaving each other. What particle is being exchanged during thel/t8 aw)r.as r 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 weak interact xeu)vs 48ikcgy(j 15bion 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 elw+x -sc5r i5b3r*p mefectron 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 virtuaq4fz*e/ 0 rg2(4u, zk wufohnhl exchange particle have on the range of the force it m wh*24uhzqnz,f geu4f/k (ro0ediates?

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 fot/(d/ +b;y(mg s h10ahxdiy nhrce 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 f wvv.rw* h/y,zorce are very massive (about 100 times as massive as a proton). This would lead one to expect twz vyv.rw/, *hhat 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 is+ n:k9wu+f k0we9lebe 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 trave20udld dv(tiafb 2h8 (ls 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 creat8yg3ld/med wc( ww7w11l3 ccte an odd number of electrons and positrons is that such a w/c8( tclw7w3y1d wcgmdl3e1process 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 w a sz2wqa;tlv5mjb 1g3o 4qva x+s-3)permissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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 al1 hrshy(jcemwn0 )7i 4lowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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 aahdo :9c9i h(jcej p9as1f55gllowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 ex tuku,+a/o )nlample 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 exampluzw5-zg wr 0-nb64uele 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 examp3a;k ly(w--t5ilx; ;jfagey ele 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 exampl m6g5pg d5vjb*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 intuy5ch ;(bj lr4 (1sh nw+qd(saeract via the weak nuclear force (and presumably by the much wenshl 1 q(h +(casy (d45rjbw;uaker 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 i-0f he7l: x e44wi z/7(jwjp78evvuqat;pms bnto 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 co)uo4 74-dkkd2jqi7e binx; ibmposition 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 that there1e ;na eodo(f/xef jw8),/m fq*o8ry

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 anti/c q*hj8(9 tmw;c 0 yyuk0evckhxw4 a+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 absorbs a gluon, the quark chzbe4;4 q r:jc5wl ,qspanges

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 ofl,4gqpby 8 e0iihha kwpw647j*h yx 6.0ggo4m 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 considek,:;ley xdbb bf1ss ,n:k m 7o.tek6/bred to be one of the four fundamental forcek7.exy ;nb ,s b,smlb:bk o :d1te6/kfs?

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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 fhofu *q i,-adt;)etj/orces of nature was the discovery that two of the so-called fundamental forces were two parts of a diq/t ht*j;e)- of,au 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 tti of 1 v0.ov1ar*tax99clk8chat would unify three of the four forces of nature. Which force is the one it would not099f1 r acv1xtkvio*l 8cta. o 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 electrons p rd4dey)abe*fz-+lhhl568 qq 1:nv0ojbqt *?

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 ;vd 6. xroqfve5vctx eq+f+grp4p;; . 10 MHz. What magnetic field is needed to accelerate protonfc e6qfexv.+pr4.+q;d5gt ;vrx; ovp 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 1.7-T mbcxdz9b4oh5a y1 +vqkrsp i81e h9g/*agnetic field. What is the frequency for the applied alternat1b yhrexb ip1 9c*o9z/h+8kqv4s5 d aging 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 radiux7 ems76 (a7t h9qs.kijjym *ds 0.25 m accelerates protons in a 1.7-T magnetic field. What is the kine(y xkt7ah7sme d7* jjm6i.sq9 tic 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 chw 6 hg4jc3swh1k;fo 17 2ekjeuarge as a proton but approximately twice the proton mass. Suppose 6g k1kesc fw4h3je;ho72 wj1u deuterons are being accelerated 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 proton-antiprot,ozm g+ki68ho4u) c tgon pair by annihilation of a very high energy photon. The proton and tc8, o)zgih 46o mut+gkhe 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) decays, el w6 dedzl+9jf 4/o6kit emits two photons. What are the energies4l9 wkddf66ze/ ljeo+ 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 times that of yq,/;9juf3m j e0 k vh:ruyk:*6tj:r atkavg; an electron. What is the range of the force mediated by this p,m uv:;at ru::3 j;y0/kt g6f9jkqyk varj *eharticle?

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 witur mns*(f0y*d ilx6jc;1ep5l h the proton as the virtual exchange particxmpl d0 r ly6jcs*;fu1( 5ein*le.

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 react08 xw5 wxitz:eion.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

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 reaag)(r /mrh rr . eu.0tzlmq:4y:yb :ltction. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

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 reactio6ys zrdc9e-dh q2 j28nqydv:-n. $\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ?

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 deuo7id.p wn)w9*zee8vh;x(x qqteron ($^2 H$) is

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