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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 part; pn+)f- a ,wvhxyk/bzicle if its speed doublehz-y;fvp ,n w/+)kabx s?

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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 6m1u*f drrb)vpi-alrd7m a ;+a charged particle if the radius of idi- dpvb6mal 7*+fm 1rar; )ruts path 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 appro9tj6j;f 8 arjmaching each other, interacting, and then leaving each other. What particle is mrf;8j j9j6ta 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 shows the weak interaction of akxydmlj4 cpvci 7nh);2:4 ry 9w1h 6+ ljiuj0k 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 uhqug8;;/;as+0 u xaqgup y+uis

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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 p0j xnf:lu f*h7article have onn jh:* 7fux0lf the range of 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 forc qi* .ewbu0w cp5ep.w/e 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 weako:l.3(mquvn nb, zoe( force are very massive (about 100 times as massive as , o((u3 vzlb:neo n.mqa proton). 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 quarw20oc4xza 9lwr)l: ix ks 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 travelsq5/pdupedy:e-:)tmto n0b,zz2- brh at 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 azzs o/j 8f3eq9n odd number of electrons and positrons is that such a process w9z fjzso8e/3q ould

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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 pewixqtt2 g 8mqr5n*vx8.m:xd1 p tld2gs t35j*rmissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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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 alloww0hfe mh)0iv +)ol z:eed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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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 allg b7z6t6*jj wzowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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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 ofvqkp4c(2rh3l n;e s4u

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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 examps1k)g85e2cswqs6 aur -ty wg4le 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 example9aem0h yi sntwk*3 ;ep) m:ku+ 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 examplex2.w) xlao8e (m ova)v 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 interact via the strong force but do -lrpaw+ pzw 0+;,5as4ewlntrinteract via the weak nuclerp- 0wa++tl4wnls,ap;wze 5r ar force (and presumably by the 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 two subgroups calla pwn*qdzbrm 3 ud*/) ,5qr9czed

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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 composywtl*) dfnv6nj 5b: m+ition 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 featurej6 mx-zyu8+ i14irc a;qm8c ijkdub85 of 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 quarks and3 hhxm/a 58fyy 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 ch8rv x.e9odd, qanges

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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 quarksf*vuomyd2(d/5 x6q pf 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 v8p7aqr 6x6olbe one of the four fundamental force ql6p avx7o6r8s?

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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 (n)xxhe1 - cdu0 2jtkamir.* qthe discovery that two of the so-called fundamental forces were two parts ofi-qmc.0a(2t1r*kexjdn ) hux 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 that would3a np yas2ohn;wpz9;; unify three of ; apnwa29y;3 snzph;o the four forces 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 kefaq0mew+03 c9 h(ru 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 at6e(zo2o o*ry a yd*8h(g/kshg 10 MHz. What magnetic field is needed to accelerate protyz2ey(dg( oo8/s*r *hh6ga k oons?

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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 pnsmk)me;y:,s o mybr(0 8 uvr/rotons in a 1.7-T magnetic field. What is the frequency for the applied alternating voltage? sy:o8 m/muby kr;()msn,v0er

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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 accer.4g ly+- evxfoy )f9slerates protons in a 1.7-T magnetic field. What is the kineticlo) g+ f4yyr vxe-sf.9 energy of the 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 chua xm ps+u,6sdkj8 lt.:g18 p53rqi jlarge as a proton but approximately twice the 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 l +8aupi,mt8ux6jj pr. sk3:glq1 ds5field 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-antiproton7 8/asiv;jcllg b/wy-ez h00r pair by annihilation of a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. What energy photi jwsba glc7/yrez;0l0 -vh8 /on 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 + positrkyy. (f+ hlwl5, fb)dc uxr/e0on) decays, it emits two photons. What are the energies of the /.0b d+w(l,kly y )chex5uffrphotons?

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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.kf8ay5toq (j0x(d,gu What is the range of the force medij 5tdgk0fy( q(,a x8uoated 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 forcepxh6n pqc)mzc *+lr 6- with the proton as the virtual exchange particlc*np zrph6+xm)-q6c le.

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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 8y4dqb)f y qao,j v3*uw(/tdcin 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 theu;1xzi1:q+8ce hsdo6ljt)/ hr4yb jm 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 partqs9*ij mrynq)i2w.* qicle 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 deutero1y30 kpvj (itx;dx8tv dz-xa7n ($^2 H$) is

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