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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: 游客未登录  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 if it7n7su mdm+pk-t sx 0)cs speed doublestsku- +7m xcpsm) n07d?

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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 charged particle if the radib5ry96pckp: u lvf 8j2us of its path d5f2:y 6 p9cljrvbu 8kpoubles?

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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 other, interactink+j-zmely f 8;g, and then leaving each other. What partic fm;j8eyl+zk -le is being exchanged during the 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 showscm-b ekn7ys .5g kqz-chb+n73 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 electrorya3vr, bw)5w n 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,1.jqyzi.f z.wv 7g fx the virtual exchange particle have on the range of the force it.f.zj1z7g .wyivfx, q 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 pks(irb(l k(: for the weak force 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 force are very massive (ab;5ixi b9kq d el)v ,ftkp/+,ljout 100 times as massive as a proton). This would lead one to expect that the weak fov9idb xtq5+)/,lk ,;fi jplkerce would

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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 callcf 0 h- n3fmlv;k49fkyed

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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 s/ xj0xyt5 l:iypeed 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 odhn7k6v 1 0ip i3by j nm):7ylnk58dusjd number of electrons and positrons is that such a process would h lni6)3jnm7yvu:51bi8ky0jn 7 pdsk

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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 permie)5nev7 jp ni8ssible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is the following decaynwz*g.*: / p/ojam;jwirfo. o allowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is the following decayzoyawa)0p+hpse g,1 oe 21h-uy4 a(na 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 example offeen ij vzi 92(-/ 0cztbs)fs-

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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 o6g*5whd,jq n,m r r+qvyk7u:wf

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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 ofkzw3*3wwq i*g

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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 ofp2alznc 0mc)uh 6uis.,5w7xv

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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 t l;-n oc6836trdm gj)duevmt*he strong force but do interact via the weak nuclear force (and presumably by the much weaker gravitation force) e3m-dg )tt;* d6jrvmuo6cnl 8are called

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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+x. 0 ez yk6/bl2sszclm,uc(8 kjc9apbgroups called

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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 composition of az wndu hsih4)xl5tg:f ll(653 $\Lambda^{\circ}$?

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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 quarkszd-r; e .ilz;xa sp+ k2-kd.hc is that they

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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 isd52gzw t/v-xt7ll :ox

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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 ms iks 1t21 ws1ezdy.0gluon, the quark changes

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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 ofg6(ex*em a0i+gjew+c quarks 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 be n s5:c+*dnrh dzod2*l one of the four fundamental forces?cdl2*+zs*dhdn: o nr5

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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 j15e9 ldi/dmb was the discovery that two of the so-1j9 e/5 lmdbdicalled fundamental forces were two parts of a single 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 a sought-after model thab hyea)es u:s076jb u;t would unify three of the four :;shuu0j6yea)b eb7 sforces of nature. Which force is the 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 for a beam of 1.4 GeV ,/j +pndhof: lzl /xp8(49abdw5oqyfelectrons?

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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 2nzfqwq928kv 10 MHz. What magnetic field is needed to accelerate protonnq28k v 9f2wzqs?

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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. Wh m9(yg4ul cr *gtot-sr 79vj,lat is the frequency for the applied alternating voltage?l gl(rgvj7 orsu -9ct*tym, 49

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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 p9hzj 63*- ,uv d*lzg ynjcady-rotons in a 1.7-T magnetic field. What is the kinetic energy of the protons when they leave the cyad9 hd*juzgn,v3*j y-zl-y6 cclotron?

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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 sameq cf6:q4g9 ,v 4rrqave charge as a proton but approximately twice the proton mass. Sua9qvr,r g4qe6v4cq:f ppose 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?

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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-antiproton pair by annihilation ofw vsgd s7m9p0oa ir+34 a very high energy photon. The proton and the anti-proton have thswigpmo a0vds743+r9 e same masses, but opposite charges. What energy photon would be 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 (electron + positron) *u t /t.4d4; ccv+qmewhmq/tddecays, it emits two photons. What are the et tcd/mqc.u+ d/qv4h4tw; *emnergies 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. notgz(j, /, 9pp0n gnxggu9xa dx f*11 What is the range of the force mediated gpnugpx9njo 1f0d,tg/z(a x g*9 n1,xby 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 wit4 i(+hlh8 wa 2nwkxw8nh the proton as the virtual exchange8+ ww2hinw xh l(k8an4 particle.

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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 bus45z3fefl( pud;7gn7 y(o oin 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 particle in the following reacza sl-.m6qxc )- veln,tion. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

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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 se v .s 4pf/q*ehf;8 *qq,rlezthe following 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 ih fo;0 ylzmrq)9k2n :zn a deuteron ($^2 H$) is

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总分:43分 及格:25.8分 时间:不限时
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