Physics Unit32: Elementary Particles

1#

What happens to the cyclotron frequency of fboqfo6w iuk1+6k+-na charged particle if its speed doubles?ob6w nuoik1 q-k6ff ++

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 cyclotrwbeqiu6(muc ++1 j8vkon frequency of a charged particle if the radius of its path doubles?m+8+cb16k (i wvquej u

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 oth/yge (,vlf vx9er, interacting, and then v 9,f(e v/xyglleaving each other. What 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 shows the weak interaction of 6 ;-xigvz.gz 9 dsy5mea 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 electron isiey/k7r j2nq784 q bkc

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 l7y0q hsbr y:)mass of the virtual exchange particle have on the range o7rh blys0 :)yqf the force it mediates?

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 force9w-.(forz0oufp e:d l 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 vemce)v(/ujr,g5 q eq yy*j ut9 eu0,u3vry massive (about 100 times as massive as a proton). This would lead one to expect that the weak f (e5u 0yq/eue9 v3q*)mv gu,,uj jyrtcorce 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 qu; , zhwfy7x ;h8;*t;7ykpzv ropc+jzzarks 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 sp m7omyh8/sq j-eed 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 ej+9xx4od 7d51cn :d)cyy foq not create an odd number of electrons and positrons is that suco jfqdy x7)d+o5 c:ync149edxh 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 permissibl. b*dmk:mb t1me? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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 allo:,tm y+rw(a7 jf- khd*bjlg9j3x,zlkyea 8w0wed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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 allowe8; u +,a+,dzkkbe qh :wxlvw-jd? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 exam 7 *jh).w adjwd4e;zhlple 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 ofg a.e5f4zw:m n

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 exampwnz.m64+whf7l khfm+le 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 examp:uu m k1.l9j*m:4 evvoz*kg jcle 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 vl (yv l-nb)+z. bwz+hcia the weak nuclear force (and presumably by the much weaker gravitation force) are ca bv- (+cyhw+nz b.zl)llled

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 su;uz:pzwf3/-(.ot 3jzi m qi ci8uaw*nbgroups 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 compoc91 *lsi0v i aomrv3b.sition 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 quarkso8h,e.tf5 hgb;wx jn5 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 antiquarks keg 0h.s7mph: 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 :g(i469av0rtzre pkq;d2 k. nch ,zmqabsorbs 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 quarks isr pqv;r:6. vtj.9u5r wfdjt,t

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 cok dd378.k4 bhx3n1)2(a n e3j ixuwzfea0oly hnsidered to be one of the four fundamental forces?( az1d dya3u n7 xxl enw0hboe8 kfh)432jk3i.

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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 was the discovery tha)a ibe),acc5 px1zj:t t two of the soj exz,ap5:t) b)c1aci-called fundamental forces were two parts of a 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 that would unify three ot, u4/8rizpuw*e0co qf the four qizwu/ ,et*0 8pr4uco forces of nature. Which 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 beu,i0y-e6kn rr vt9b/ ja v:u;iam 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 10 MHz. What magnetic field is needed to accelerate projs a;0 rg:7efkyxh;o::; fsj:;exk7yoha gr0tons?

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 radiu n/6twue ,ln/cw-8ca cs 0.25 m accelerates protons in a 1.7-T magnetic field. What is the frequency for thtn /ec, / acwn-c86lwue 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 protr 2si:nm)-7h haj rz7tons in a 1.7-T magnetic field. What is the kinetic energy n72rithsz:a- 7rj)h mof 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 chargena3c5 a8ma *se as a proton but approximately twice the proton mass. Suppose deuterons are being accelerat35esac*a8 n maed 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 creatoj50a 3*l ju y-a4c+m:o2 )czzsubcv ue a proton-antiproton pair by annihilation of a very high energy photon. The proton and the *s)yj:az2cu ua-0+oc43 ulz5cjv b mo 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 + posine mr;lka jhdo +bwy,)65uw6 2tron) decays, it emits two photons. What,5blj u)wdmay o6e +w2krn6h; are 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 mass of 264 times that of an electron. What is the rmfb p. 3( v)ctqj0*scvange of the force p f.cv3q (0jc) sm*tvbmediated 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 forc iekt49dt09k ve with the proton as the virtual exchange partici t0 4ekdt9kv9le.

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 fat25 +ejy.x-+j l ao0kzo;xyyollowing 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 particle in 09x3v- qeqfdbthe 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 particle in the following reactihaswqh0u0, j// 9x)rajsa4 anon. $\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ?

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 deutero- yrown;z2tb 20nt3yx qxuj0 .n ($^2 H$) is

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