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习题练习:Physics Unit32: Elementary Particles



 作者: admin发布日期: 2023-05-02 09:40   总分: 43分  得分: _____________

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

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What happens to the cyclotron frequency of a charged particle dg bl6ogtids;g7dx y6: .;up5if its speed double.xg lu6td;di7dos ; g:b p6y5gs?

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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 cyclotron frequency of a c cbh -7n h).ry(i:idtoharged particle if the radius of its -do: b7hhc(rtyi.) nipath doubles?

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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 approzjyw d*4pc55m2t * qpyaching each other, interacting, and then leaving each other. What particle is being exchanged during tyj p5zt5d4 w*ypcq*2m he interaction?


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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Feynman diagram showr-2 )k9lc ozxks 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 electron mfuf v80,yfsr:av* j-is

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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 exchange particle havegrg .v.a8e1 w 7egz zdlm7p.*s on the range of the force iteg vz.a.wg r.8z *eg 17psdlm7 mediates?

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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 f z0)w*s*kwea horce is the

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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 forg)xj;oyb2,/ *ete ra vx :xy*mir;sd (ce are very massive (about 100 times as massive as a proton). This would lead one to expect that the weak force woue,vtird;2 xx ye*j * )/ar:gm(oys;b xld

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The exchange particle forwy6ig 3fy7etu3i p.s: quarks is called

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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 ayz )qd-d.5ow vzw f99qt the speed of light

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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 odd number of electrons and positrons a4.ahs d qe,3mc2wjqmn ( ,le*is that such a procesa(h s*q a3n,wed.eml4jcmq2, s would

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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 permissiblecw6 o5+ft0 nkdf,m4az yf9*8xtqxt r -? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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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 apnp8wbv5 zlw88jed;74w+r sm llowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is the following decayy5 6s*hnihn(c/8bzi0 aedia . allowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The neutrino has

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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 exaym vvz4 ky/ zz5c+8a- +zoqj+omple of

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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 od.2m eqcsg(u.xhgx 6 2 p5:ydgf

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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 example am e,28b09zx s.vnoquof

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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 example o 9 .jtr:1zijelt;m3 iff

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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 s7 o/tc5 9u 10xq)xmlqb (yqgkqtrong force but do interact via the weak nuclear force (and presumably by the much weaker gravitation force) are called oqb(g yuq/xt9x0q m51qlc7k )

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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 called12yf)a+/gt h aokt0 ez:k5mg+kuu p g0

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A quark is

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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 compo-a(gs7 *n-tw.u g xtossition of a $\Lambda^{\circ}$?

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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 t q w(/htw62ym9+d g3mbbqwaw80i-f xnhey

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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 andv*nz8ig8s)p h antiquarks is

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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 chang5dx s5l iygw69es

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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 qonaqn qa:t zkb m9dke,p; -go5d. +d53uarks is

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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 bef9t sm 96p;lafe4h m;v one of the four fundamental forcesl6f e;4h fma9smp ;9tv?

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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" th,yyi1d (* oiowe forces of nature was the discovery that two of the so-called fundamental forces were two parts of a sinio1dy(wyo* ,i gle force. The two forces that were so unified were

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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 *85 olrnjnp b)a sought-after model that would unify three of the four forces of nature. Which force is thepj8nrolbn) *5 one it would not include?

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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 f1.bbf, l -cbzlor a beam of 1.4 GeV electrons?

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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 accele0k+zz;jpf 1 uorate protons?p kuj oz;1f+0z

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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 magnetic field. so09k2li,see7+kc gi)/o* jdop sht -What is the frequency for the c,o09l seo* kjsiiotes )g-dp7/+2hk applied alternating voltage?

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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 fi hpikc5: sy) fu75lu0id)-bwweld. What is the kinetic energy of the proto -)h7 lpswu5kdcyib5i )u0fw:ns when they leave the cyclotron?

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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 but approximately twice the proton mbwrm q hnax55 3wxm5 mxmf20(+ass. Suppose deuterons are being accelerated in a cyclotron in an orbit ofh2w5x50bf+m rxwm(x mn35qma radius 75 cm at a frequency of 8.0 Mhz. What magnetic field is needed?

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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 +1e)lx e+jzn+vzwkj43ye 0anproton-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 nezee vw+z0k + najx43y1jl)+required?

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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 (elew:8u x1xzh(e5cj q0 no0 ozr;ictron + positron) decays, it emits two photons. What are the energu nqz5i (j0xcr8; 1h:o0zxow eies of the photons?

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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 rae-v(a cxouh*s 7 5q*kf6exh3j nge of the force me67j hk*vxe3xcf5aeq uo s(h*- diated by this particle?

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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 w1qjzpe :)nl, as the virtual exchange papjz ),: 1wnleqrticle.

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Identify the missing pa:g :m-6v mp9orlmkq9ivy;3tkrticle in the following reaction.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Identify the missing pauuli7xszc*m* 47 :f ue(ej1hkrticle in the following reaction. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

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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 folloo86ox9fzx, jkwing reaction. $\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ?

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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 deuterr /de a)i4rbzv+izglf, ll.) ;on ($^2 H$) is

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