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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 itsmp z36mlbg;pw)b*kt n4 g.ex7 speed doublkb;gl.nwp 3*gp7bm mte x 46z)es?

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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 cycloh( o,*;7m,sdy tot ueatron frequency of a charged particle if the radius of its path dot*7; ,ohaods mytu(e,ubles?

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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 u vdvx/9x+ml ,ny n4;.mg/qhlother, interacting, and then leavix.l v ;mm+x/h,l/ vudng9q yn4ng each other. What particle 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 shws fjk1zrt sx:( 8.:ghows 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 )iul0tt(;wpdzt fv7*: kczg4 electron 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 oih ,* os:vzr3zf the virtual exchange particle have on the range of the forceoz3s h:v ,z*ir it 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 force is the8h 5nedt1,9 aypgc5qw

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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 (abxc j87iw3 d7bbecz+1gout 100 times as massive as a proton). This would lead one to expect thcbgx ibdzw+ e3 c1j787at the weak force would

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The exchange particl8u ow3au j/bd::0o qk*d 0oiave for 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 at thuv99it usdt6sc yi1 /:e 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 o t1j- ebi4oi2s.8..h mm4 gg yh)rc r6l2okjonumber of electrons and positrons is that such a procesl-j.oes4oc82 mrh.htbor1m26y i)j4 k.g o igs 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 decaykxejuntv,*nva u1 n :mp08 t6/ i.uwl7 permissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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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 a e; 5vf yo0agdd79i(tqzsw+g2llowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Is the following decay allakd 39z/sw r4*fqx2rw owed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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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 k 7h7e51y cbkqfjq, hjmuh;)3of

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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 of;sa-e1he /2lfr8u b mr

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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 exampleoy 4 2gk74yiwd of

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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 exampi8 hjv1w6n dxml+jnze 4t 4*:ble of

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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 v-u.o ys-5iaqenv:jpq4 qy:0interact via the strong force but do interact via the weak nuclear force (and presumably by the much weaker gravitation force) are caliy-q uj y0vep:4.aqo:s -qn 5vled

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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 cr.n 9 k3dyxe.i )v.hq1wve x(walled

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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 a tm. m1c1ed+j0,mubk.hz5 l 5 bud sm1q$\Lambda^{\circ}$?

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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 quar5vlp* o25svy )uvx68i :qc rciks 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 andi5 yw)k 6otm25cjz;u p 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 c(kyd0e 9k azg+)+pm vquark 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 of qual2+jfnobj p,*8v(r1 mj z2kfh rks 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 one of the four fundamental4f3er seym7,h force4e ehms 3,y7frs?

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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 b r)gx9cexfg/e;e 9 (qg/g7rl c 3hw:sof nature was the discovery that two of the so-called fundamental forces were two parts of a single force. The two forces that were so ug3x) xce;r:r9s cb/q hgge lfe9/7w(g nified 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 that would unify tq9n 5vayk*pwgm 2 6.qehree of the four forces of nature. Which force is the one it w v96nm5ke2.wp*qgq a yould 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 +thw 9y,o tx2qelectrons?

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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 fie3k u79nrxgt xmuls l40q7x/(wld is needed to accelerate prot r7nl(t7/uq4xlw9suxgm3 k x 0ons?

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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 acc/;,mcs 4r6muv eagv 5belerates protons in a 1.7-T magnetic field. What is the frequency for the appliedv 4cmr5bme/6,;u v gsa 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 ma)yj ap( 89rhus+i5norgnetic field. What is the kinetic energy of the proto ra9unphs(8+yjro5 i )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 ast; gpy6t1by9s a proton but approximately twice the proton massy b1;gt9sypt6. Suppose 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-a,cpkj 0. kojb)ntiproton pair by annihilation of a very high energy photon. The proto, j)pj.ok kc0bn and the anti-proton have the 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) decays, it emits two photons. c1yb,xlrit /l1v)b 4t What are the ener c)1ivbyxlbr14/ t, tlgies 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 rangglsho6 /+ d7 tqmu/w3ie of the force m/s6 w+io3tul 7g/dmh qediated 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 as th od+vhhpc2( e.e virtual exchange parti cdph(+voe.h2cle.

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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 followikz)o hft(rw :l*r ny,80fbx)zng 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 particl. rpk8:f+vgfde 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 te-s7vg. ch27se cv9t whe 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 in a d oa+0zk4,ja6yvbp rb.euteron ($^2 H$) is

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总分:43分 及格:25.8分 时间:不限时
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