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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 if ije s8 dsvx0tnx /e)c.4ts speed doubles?xe/j.0tv4ds 8 n exsc)

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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 partic *ao,ojnptxy-u p57:j-tv fq 5le if the radius of its p -vjpy7 j x-,fa :*opqotn5tu5ath 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 approaching each othei pja+vf b0,x l9uj2c59zgr y;r, interacting, and then leaving each other. What particle is beivfj;b5 ga2i9pj z c,+r ylx90ung 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 shows the weak interaction ofc+zmv ;5 std8s 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 e ocm tuykv;)w--j.1cdc5 u7bwugv5e-lectron 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 cb9to w. e, ;zh16)v:whcpz gvin the mass of the virtual exchange particle have on the range ov. w;vbeh zch 6g,c:wp)19 otzf the force 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 tho 9hcdr7k9ak 6w2mlc/o* 2jvde

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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 massiveg,)a v3 3y;q stz/ zsoxufzy2;; pvn7qhwk/a 9 (about 100 times as massive as a pr/ x ;paykqonh z;37/ ,qzu32s t;avy9z fs)wgvoton). This would lead one to expect that 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 particle for qus1* v1o gjtucqim 3h mr(8m6:karks 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 f6-th x;oj et1the 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 vrmfc3*nue fe t4)7 xy)go e)5could not create an odd number of electrons and positrons is tha )ev*r nu)ecy g)3f4mxoe t57ft such a process 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 permisl oju ngtwnhwph;h 99/,c. :-nsible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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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 allowe +i4i pq1poyp)uu,+dqd kyv,4d? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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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 allowedvxpu mek89qk+)a dg ;8? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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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 exampym uzimn) /.8r 4t,cfi27bsrfle 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 exampsjpsl7 3r+/ x sslbjj9d1d5ff/ryp(- le of

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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 g(.9+t+ds.kv r eu5pf5wc1flq ldx8z 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 example ofc y+4 x9udz1hh

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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+cn t b f;6lgz3c+b(no do interact via the weak nuclear force (and presumably by the(6l b+nz+cf3tc ngo ;b much weaker gravitation force) are 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 tw f66j9phas(1 src fqx-o subgroups 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 com0sixq ) fyh50sposition 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 of9;:8dygm6vf z o1rgnd quarks 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 quaeihafh0mw yoc;1q10 n3c-1p tn 8dv :rrks and 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, to+y ujol3 +d;bhe 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 of quarks hb5j 2v0z. vcmis

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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 no 4yfz7m-t0sb2f i9(kcx py+z jt considered to be one of the four fundamental force9 pz2cx mj (bf y+tkfi7s-04zys?

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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 that tu (k)h4d kz,v,i;ghd dwo of the so-called fundamental forces were two parts of a single force. Thd4)id ukvdg; kz(h ,h,e 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 mxoqtzh0(f2:9kws , l kodel that would unify three of the four forces of nature. :0kos2f l q,t9(hz wkxWhich 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 fa o 36uqoqb53kor 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 operatesok 4c0 b-(qfm7-hlenf1 7mi uc at 10 MHz. What magnetic field is needed to accelerate protof le- q-mkmccu0o1fh7n( b47ins?

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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 b kq8e6/p7 jp7zv*t rfa 1.7-T magnetic field. What is the frequency for the a*77j6 qrbvetf8/kpz p pplied 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 akkfj2o/o) e )smgpgcj*z9 .h 6 1.7-T magnetic field. What is the kinetic energy of th)mc6jhs/kofke2zp g) . go9 j*e protons 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 4engr 8 h;e-gcthe proton mass. 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 i8c4ee-gh r;g ns 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-antiproto:ve vd* cj;uk8n pair by annihilation of a very high energy photon. The proton and the anti-proton have the same mukv; j8 evcd*:asses, 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 jx+mb1 t*n ufr1ovx4az-m/x; (electron + positron) decays, it emits two photons. What are the enarxjz-1/ um41ft bmxn+xv*o ;ergies 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 of8:wsxm g9t; lb 264 times that of an electron. What is the range of the force mediated by thismb :xs9l g;tw8 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 c92ie7mea rimca4:s,the virtual exchange pa:94smri cma7a,i2e certicle.

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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 following reacffi72b .z +v6c -cnfav0dnp2 mtion.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Identify the missing dlnkg fy7 4(v k4(ac*mb rxm (krj *))an:v9mhparticle 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 par m2r1ozbss .xh* k63irticle in the 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 deutero9 ejf9w7+.ywrzvs5eb n ($^2 H$) is

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