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习题练习:Physics Unit32: Elementary Particles  作者: physics  发布日期: 2023-05-02 09:34

答题人: 匿名未登录  开始时间: 23年05月02日 09:34  切换到: 整卷模式

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1#
 
单选题搜藏此题  
  What happens to the cyclotron frib z8o5fgzc0 azfc65b5n2 yp-equency of a charged particle if its speed doublesizc2gpb5z0-b68 5y5of fac nz? (1.0 分)
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2#
 
单选题搜藏此题  
  What happens to the cyclotron frequency of a charged particle if the-;g80zwcj3hq+*n q2eaqn0ei e sq) wu radius of its path doubles- q+*u)aqqj3siw q;ewn0hc8 enze 2g0? (1.0 分)
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3#
 
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  The Feynman diagram shows two electrons approaching each olfts u;9dgc2 6ther, interacting, and then leavd2lfu6 sg ;c9ting each other. What particle is being exchanged during the interaction?
(1.0 分)
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4#
 
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  The Feynman diagram shows the weak interactwbq f) fg-5rl4ion 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?
(1.0 分)
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5#
 
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  A positively charged en 1iiwpl- t9c9kky* 9blectron is (1.0 分)
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6#
 
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  What effect does an increase in the mass of the virtual exchange partihbwqg/ft z5lc)kg/u 4: / vm+1w qq1agcle have on the range of t1w/1z k: g/ qgta+uwcfg q/bvlmq54h)he force it mediates? (1.0 分)
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7#
 
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  An exchange particle for the weak force is themngas ab+f5s.9+zv7 g/wzow- (1.0 分)
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8#
 
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  The exchange particles for the weak for18hoz3a8x t9nodpt n3 ce are very massive (about 100 times as massive as18pon9oa3 thnt 3z dx8 a proton). This would lead one to expect that the weak force would (1.0 分)
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9#
 
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  The exchange particll8j15tg,k o n(yst usuy gu.25e for quarks is called (1.0 分)
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10#
 
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  A particle that travlko495 0pydwrels at the speed of light (1.0 分)
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11#
 
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  One reason a photon could not create an odd number of electrons and fswo e;g(0 lai(tcp,n)-1abg positrons is1fs ) 0ao;a(pw,l e(ig-tcbn g that such a process would (1.0 分)
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12#
 
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  Is the following decay g qwqtr,/qw6j f:wc(,permissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$ (1.0 分)
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13#
 
单选题搜藏此题  
  Is the following decay am w+(isc6j,xu llowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$ (1.0 分)
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14#
 
单选题搜藏此题  
  Is the following decay allowed?o;i;xk1s)xla $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$ (1.0 分)
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15#
 
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  The neutrino has (1.0 分)
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16#
 
单选题搜藏此题  
  An electron is an examm hw.20qa 5l;j0kh q /aeg.sajple of (1.0 分)
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17#
 
单选题搜藏此题  
  A proton is an exampl3qsp i zd1zvexd5h.nd*+ p, v59thf 2le of (1.0 分)
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18#
 
单选题搜藏此题  
  A neutron is an example ob z;s8vkoc c:t- x2xo:f (1.0 分)
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19#
 
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  A photon is an example ofzouh7(uu;x8o u . hfo:)rn cv) (1.0 分)
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20#
 
单选题搜藏此题  
  Particles that do not interact via the strong force but do igb7 k,aw(r 3;vhszc 7unteract via the weak nuclear force (and presumably by the much weaker gravitation force) are callrgv a ;(w37u,khbcsz 7ed (1.0 分)
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21#
 
单选题搜藏此题  
  Hadrons are divided into two subgroupux)f:wahd9yuh f x 180s called (1.0 分)
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22#
 
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  A quark is (1.0 分)
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23#
 
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  What is the quark com:s9y lcaxy24/mp/ ll2am)cv-l:bw mgposition of a $\Lambda^{\circ}$? (1.0 分)
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24#
 
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  A distinctive feature of b*jjdor* hz*; quarks is that they (1.0 分)
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25#
 
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  The charge of some quarks and are1fyi: 8n kw+ntiquarks is (1.0 分)
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26#
 
单选题搜藏此题  
  When a quark emits or ls-w+baw p b+2absorbs a gluon, the quark changes (1.0 分)
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27#
 
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  The number of types of quarks ie pwp3u +/q;(vm)p ifls (1.0 分)
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28#
 
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  Which of the following is not considered to be one of the fo6w3 prgy:fdkogb1/bq *wt7j 3ur fundamental forces? t/31b gk6f*ydo 7r3b :jpqgww (1.0 分)
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29#
 
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  A significant step in "unifying" therufv 8,ek7 6jfp4dkme5 6-jbr forces of nature was the discovery that two of the so-called fundamental ekff866j mv ,-k 5de7rrj4bu pforces were two parts of a single force. The two forces that were so unified were (1.0 分)
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30#
 
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  The grand unified theory (GUT) is a sought-after model that wowaxh( ef pm*34uld unify three of the four forces of natua(43pmfh ew*xre. Which force is the one it would not include? (1.0 分)
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31#
 
单选题搜藏此题  
  What is the wavelength forlaebok0*pnk b2d43 if r:;d:d a beam of 1.4 GeV electrons? (1.0 分)
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32#
 
单选题搜藏此题  
  A cyclotron operates at 10 MHz. What magnetic field is needed to accelerate pro8i1fg s5r th,dtons?h1dg5i ,s tr8f (1.0 分)
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33#
 
单选题搜藏此题  
  A cyclotron of radius 0.25 m accelerates x6lc p)aj42bwyc lq:5 protons in a 1.7-T magnetic field. What is the frequency for the applied alx2wbl5: 6a4)ylc jqp cternating voltage? (1.0 分)
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34#
 
单选题搜藏此题  
  A cyclotron of radius 0.25 m accelerates3 zvgd vt69t2ydspsrk9z *d2 b;,mk p3 protons in a 1.7-T magnetic field. What is the kinetic energy of the pr,d 93 v2tdvm2skpbptgz6k3d *z9 sr;y otons when they leave the cyclotron? (1.0 分)
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35#
 
单选题搜藏此题  
  A deuteron has the same charge as a proton but approximately twice the protxsb dz)d7h :i/on mass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75 cm at a frequency o:b 7hixsdz)/d f 8.0 Mhz. What magnetic field is needed? (1.0 分)
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36#
 
单选题搜藏此题  
  Suppose you were to try to create a proton-antiproton ph8v zhzrz87e* fl:ng 1air by annihilation of a very high energy photon. The proton and the anti-proton zel788n fv*z h:z1g rhhave the same masses, but opposite charges. What energy photon would be required? (1.0 分)
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37#
 
单选题搜藏此题  
  When a positronium atom (electron + positron) decays, it e1yulag98ine yc 0w,, emits two photons. What are theyel0u c, e 1awgi,ny98 energies of the photons? (1.0 分)
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38#
 
单选题搜藏此题  
  The pe meson has a mass of 264 times that of an electron. What is the ran;s xd+-amon1go1v 5 k2ac way(lvg- n;ge of theonv1lms g;-vnak dg 2a5a+c(wxo1y;- force mediated by this particle? (1.0 分)
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39#
 
单选题搜藏此题  
  Calculate the range of a hypothetical force with the proton as t w+.nfin4s,-w n t.zpthe virtual exchange particntw.p-s,wf +.ti4n zn le. (1.0 分)
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40#
 
单选题搜藏此题  
  Identify the missing particle in the following reacfb+8bsc+xd l;tion.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ? (1.0 分)
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41#
 
单选题搜藏此题  
  Identify the missing particle in the following r7,k usllae: sh- 22zpveaction. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ? (1.0 分)
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42#
 
单选题搜藏此题  
  Identify the missing particle in the following reactv*tblmo(4e wsjxv 3 1/ion. $\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ? (1.0 分)
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43#
 
单选题搜藏此题  
  The number of quarks in a deu8wuf 0adksp ax1..hq8teron ($^2 H$) is (1.0 分)
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