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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 particit7 *d5go4 na3ahx;f hle if its speed doubles?naho ;f5473d*gxi t ah

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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 cy4ga(a+i vym b 9( *p3lowravpy; (u:fuclotron frequency of a charged particle if the radius of its path df94myvp(*by(( u ol:auvi +p3w a;r agoubles?

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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, interacting, akqava g4,4w30gqw ey :nd then leavwqv0q,4 :gk4eay3aw g ing 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 shows the weak interaction of a neutr9.xg11 hmq+f9g eigv*qa im;tino ($\nu$) 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 iozng 2 i:k,dgogfl(0,s

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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 trlm;n422)f7 foqeb z y1zl3vihe mass of the virtual exchange particle have on the rangeq3ez)21nym2ll 4boivf 7r;f z 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 tg t-a/jl09z(vbgm ypvt0:d- xhe 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 qm 9hopm .dlu/ mc rdwp,7*,nr.:x/aj very massive (about 100 times as massive as a proton). Th9.mwqp ,m/u7 :*drp/rcmjl ax.,dhno is 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 quarkvp 5jwfcnnxr31i 72 .cs 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 th1fmyzfj2 3qm8e 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 number of electrons and positronsu zo+ma9lbvq9 95ez ploh s-+* is that such a process wousa -9h+*moebv 9l5+lu9pqzo zld

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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 pertsl k7*zj a ;,c10nlmomissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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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 allowed?*nyskh ca q1-wn+ pz)6 $\Sigma^+ \rightarrow p \;+\; \pi^+$

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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 allowed? 8z yrw b ):z/ r7yojz8-:mty0+vamomn$\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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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 exampls+(vpxrrcz6l; 9 5fkm 9d+nio e 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 example odoh; iw 4qt qy/uv(zcm /z3t4fq:. xj0f

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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 oxdezp w;g4b sk1. gu08 ,(fx/zv3ig4zop jo) wf

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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 exampbrzd.(49cu* q vtzv 8dle 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 interactoye2- *n(ex+ bbdx zv8 via the weak nuclear force (and presumably by the muo2zn 8(yexebbx-v *+d ch 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 subgroupss2m5k)o hpqrk8 t*se6j.n o(n 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 2fo, t 7;g;hjmjs:d xaa $\Lambda^{\circ}$?

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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 p. vhoy 3y:**tqjs+sl 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 and antiquarks iszopfh4;e*; xr

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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 ci xc4h()yq046gudp cabsorbs a gluon, 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 of 1d80j7na hbp5hx j wk,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 nz2 3q;2 gkqzm t29bry29sos sqot considered to be one of the four fundamental forceso 23 ;2 2qtrmzgqsqys9sk bz29?

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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 natureqpm1e4a-ohwcd+. 4 )acir0zl ik x9pqc) 9p k( was the discovery that two of the so-called fundamental forces were two parts of a single force. The two forc4cm9 4 0)-wk.i)r(aqkx dph 1pe9zqcolcp ai+ es 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 would unify three of: jvbh)v/z1tynqfsk40 +35jt k4cs ne the four forces of nature. Which 41njn+vhfs3/tjvse:t c 40yqkz 5)kb 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 bxj .26fh3fut 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 at 10 MHz. What magnetic field is n9rqmu0jc7m-1 gph 7gg eeded to accelerate prot p 77c9ggjqmg-0humr1ons?

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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 accelerat2uzz,tg t)l 3ges protons in a 1.7-T magnetic field. What is the frequency for tg tz, 2)3uglzthe applied 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 accel meox vi+;xcow1 cm+0ouu0 8k.erates protons in a 1.7-T magnetic field. What is the kinetic energy of the protons when they leave the cyclotro0o0vc 1x+ie u+ xoc8.;k owmumn?

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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 approximatels5 d o9-fmvrg0)qk0a ey twice the proton mass. Sup)f ore5s vqd0k0m9 -agpose 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 a idlq77+ 3tnv8po7ovc nnihilation of a very high ed+ 7oinco p738 vlt7qvnergy photon. The proton 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, dg:lszhyww ;k*s r(i0v .)q,g it emits two photons. What are the ,g(higd v0:wl)r*k sz. ;y swqenergies 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 ty ,iht0x4, cswhat of an electron. What is the range of ic0tx4 ,s h,ywthe force mediated 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 progx ;ye2yp7)l gmvu 9tmbg+,,(k,youvton as the virtual exchange particlgp o uvtm2g, ,vm9(,+egyyx 7uylb )k;e.

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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 fa* s7vf/a:e n rg)z0oaollowing 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 awmm1efklz)c vb 9);v-ilc5+h)0 h8iy :bczjin 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 the follorns(v;1cpw gmd/c+4 cwing 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 /29 dj qkxds:j 2fqi3gdeuteron ($^2 H$) is

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