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

1#

What happens to the c+- 2 m3g;l4otnmy;eu z +rocuhyclotron frequency of a charged particle if its speed doubl 2o; ou;el ncum tr34y+m-hg+zes?

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) 切至单题模式搜藏此题

What happens to the cyclotron frequency of a charged particl5f t(b,kypedzp0* d; fe if the radius of its dz; 5(yf ptpb ek,*f0dpath 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) 切至单题模式搜藏此题

The Feynman diagram shows two electrons approachir -i2(shq hohi wv+41ing each other, interacting, and then leaving each other. What particle is b( +4iw ih-voh1sqri2heing 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) 切至单题模式搜藏此题

The Feynman diagram shows ts;v)0wk (uyyv)pdjs x0i6 ) cqhe 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) 切至单题模式搜藏此题

A positively charged e ,v1pape(b n7rlectron 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) 切至单题模式搜藏此题

What effect does an increase in the mass of the virtual exchange particle h310wbmb2iv tfz vxtu -x0x 4e0:ch 4mqave on the range of the force it mediates?tteifcxxwz 14-0 4vmu2:h0bm 3 b0qxv

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) 切至单题模式搜藏此题

An exchange particle for the weak force iwdh*-mr* no( ps the

A. photon

B. meson

C. W particle

D. graviton

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8#

单选题 ( 1.0 分) 切至单题模式搜藏此题

The exchange particles for the weak force are very massive 8m :j(pux5bne (about 100 times as massive as a proton). This would lead one to expect that the weaj p mben:8x5(uk 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) 切至单题模式搜藏此题

The exchange particle for f:8dbw a eq; /otu-xwou+f;/rquarks 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) 切至单题模式搜藏此题

A particle that travels 4,.7 rb-lsg1hvgui btat 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) 切至单题模式搜藏此题

One reason a photon could not create an odd number of electrons and posip nf i u7b)8m5urwf2y5wd4m)gtrons is that such a process woul 5 m7gb2u84w)fwi u5fmn)dpryd

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) 切至单题模式搜藏此题

Is the following deca*pzvn9cgf +n 6y 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) 切至单题模式搜藏此题

Is the following decay alloy*wl zq m5/ obk 1fv86v0im1q d.gi6yywed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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) 切至单题模式搜藏此题

Is the following decay allowedc3) aw jv6z1tf? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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) 切至单题模式搜藏此题

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) 切至单题模式搜藏此题

An electron is an example of krhw*i4jmm, +y +jt4i

A. a lepton.

B. a meson.

C. a baryon.

D. a gauge boson.

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17#

单选题 ( 1.0 分) 切至单题模式搜藏此题

A proton is an example ox7 a hnq:zy6n+f

A. a lepton.

B. a meson.

C. a baryon.

D. a gauge boson.

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18#

单选题 ( 1.0 分) 切至单题模式搜藏此题

A neutron is an example ofvr6o x ij1ci -g:5+(pz ;qxxcj

A. a lepton.

B. a meson.

C. a baryon.

D. a gauge boson.

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19#

单选题 ( 1.0 分) 切至单题模式搜藏此题

A photon is an example un c85r xy/ta5of

A. a lepton.

B. a meson.

C. a baryon.

D. a gauge boson.

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20#

单选题 ( 1.0 分) 切至单题模式搜藏此题

Particles that do not interac4 yboin*ag948 p;qr.8 udbvjc t via the strong force but do interact via the weak nuclear force (and presumably by the much 98;yo.bdq4 a8gcv nbu4r ipj*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) 切至单题模式搜藏此题

Hadrons are divided into two suqez5p n7z7c.wr5w7aq c t rl3gc2:/yxbgroups 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) 切至单题模式搜藏此题

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) 切至单题模式搜藏此题

What is the quark composition ksi4/oip9 ge 8of a $\Lambda^{\circ}$?

A. uud

B. uus

C. uds

D. uss

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24#

单选题 ( 1.0 分) 切至单题模式搜藏此题

A distinctive featurs/ m)p7 hx/x3rtgeg f/e 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) 切至单题模式搜藏此题

The charge of some quarks and antiqhs, alr x *kn6+uie*0m x.qjq;uarks is

A. e/4.

B. e/3.

C. e/2.

D. e.

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26#

单选题 ( 1.0 分) 切至单题模式搜藏此题

When a quark emits or absorbs a gluon, the quan7og7*zwhs4 trk 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) 切至单题模式搜藏此题

The number of types of qu- yugaw 4, rfh(iw04 :5uliiizarks is

A. 2.

B. 3.

C. 6.

D. 8.

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28#

单选题 ( 1.0 分) 切至单题模式搜藏此题

Which of the following is not considerer pyed .u ;2;:rfzc8+o 5mo 2ajqfkps(d to be one of the four fundamental forces?omr+rqof2pp(8;a2;5 dez c.yfkj :su

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29#

单选题 ( 1.0 分) 切至单题模式搜藏此题

A significant step in "unifying" the forct,izt cha(k .x,i28 yues of nature was the discovery that two of the so-called fundamental forces were two parts of a single force. The two forces thyi.z,( 8k t,cxia t2uhat 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) 切至单题模式搜藏此题

The grand unified theory (GUT) is a sought-after model that would unify s k 0mrukvw4:6(k 39darki *-mtzxkl:three of the four forces of nature. Whxr: mkrdva(4tzk wil96ku-*:3 m0 kks ich 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) 切至单题模式搜藏此题

What is the wavelength for a beam of 1.4 GeV electa5mwl li u y 2(58jzgz,vpd7p.rons?

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) 切至单题模式搜藏此题

A cyclotron operates at 10 MHz. What mag ;7) f)ga+i4ih kxt/9hhjsr vvnetic field is needed to accelerate protx97v)gish)vf a4+rk/jti h; hons?

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) 切至单题模式搜藏此题

A cyclotron of radius 0.25 m accelerates protons in a 1.7-T magn.t; (k,yzkjshh8;dc b t8eja/etic field. What is the freb/,yt khhj8k; c .8sdze(at j;quency 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) 切至单题模式搜藏此题

A cyclotron of radius 0.25 m accelerry+o:tx 7m:i oates protons in a 1.7-T magnetic field. What is the kinetic energy of the protons when they leavyo:ot7+ xr mi:e 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) 切至单题模式搜藏此题

A deuteron has the same charge as a protovlq 3tn)uz20 nn but 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. Wha3 l 0uv)tnnqz2t 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) 切至单题模式搜藏此题

Suppose you were to try to cre2(p(uz ;*g* dborz3mofu rky0ate 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 e*0m 3 u;2odg o(*b pkzzryf(urnergy 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) 切至单题模式搜藏此题

When a positronium atom (electron + positron) decays, it emits two phov0v.qyx4)etlob m*: y tons. What are the enxbym4o)q0evt* :y v l.ergies 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) 切至单题模式搜藏此题

The pe meson has a mass of 264 times that of an electron. Whatw-g6k1* vwj t.z: mxa5 m5d.riqqtjl/ is the range of the foq -v a/d j..rmx*5ikj tzlwg1q56:twmrce mediated 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) 切至单题模式搜藏此题

Calculate the range of a hypothetical force)dxjr-ynib o j-5(ijn;e mj 0p*1vw v4 with the proton as the virtual exchar 4;jjvv-)-p( n mij0 bo jenwyxid15*nge 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) 切至单题模式搜藏此题

Identify the missing particle c9v.u*t sx8yb 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) 切至单题模式搜藏此题

Identify the missing particle c2sqt;may* n8 8b i*esin 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) 切至单题模式搜藏此题

Identify the missing particle in the followingej u+7ij0 c*wx 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) 切至单题模式搜藏此题

The number of quarks in am 9x0ny95p; dmogslf/ deuteron ($^2 H$) is

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