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PRACTICE：Physics Unit32: Elementary Particles
本Practice来源于https://webassign.org，是在线Practice的打印版，您也可以访问本平台网站(https://webassign.org/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 331 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://webassign.org/test331.html
 Author: physics  Publish Date: 2023-05-02 09:34    Total Marks: 43 mks  Marks Awarded: _____________

User Name: No Login  Start Time: 23年05月02日 09:34  Switch to Whole-Paper Mode

Mark Problem
1#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cyclotron frequloi + :b-.loggency of a charged particle if its speed doubles +o.lioglb-g :?

Correct Answer:    
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Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cyclotron frequency of a charl;h -u+e ceq/oged particle if the radius of its path doqh/+ol ;eeu-c ubles?

Correct Answer:    
Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons approah7h+rt pzwovqhigb fx7.r* 1 (c6;h 2zching each other, interacting, and then leaving each r xw(7+hcz2h;gq p6ohb7.v*ft z ri1h other. What particle is being exchanged during the interaction?


Correct Answer:    
Mark Problem
4#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows the weak interaction of a neutruvtls:ynqs- 9 i ))mc )kh7/nhino ($\nu$) and a neutron ($n$), mediated by a $W+$ particle. The interaction produces an electron ($e-$) and another particle. What is the other particle?


Correct Answer:    
Mark Problem
5#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A positively charged electron bvpichmzv5 6 * f:9or o5,vdy0is

Correct Answer:    
Mark Problem
6#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What effect does an increase in the mass of the virtual exchange3mr-ew7 :f5dtpkx -mc particle have on the range of the force5tcked3 w mrfm-p7 :-x it mediates?

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the weak force i y,;fvxun .h+t:gmdzuh:b u 9)s the

Correct Answer:    
Mark Problem
8#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particles for the weak force are very massive (about 100 times asa yi*;8 s:djcp massivesi *ypd:j8ca; as a proton). This would lead one to expect that the weak force would

Correct Answer:    
Mark Problem
9#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particle for quarks is cacvqfv()b(m 6a lled

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the speed om9 ;7n d5f5q 1gzlgkxy +jal3vf light

Correct Answer:    
Mark Problem
11#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  One reason a photon wsqhnk21, 0n (cck5fwrlo-wm1 m y:3jcould not create an odd number of electrons and positrons is that such a process wlr(3 j21:1 swo5cfmqknhn0kw, cym- would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay f2c*vvcd+svc- c d,n-permissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay alu44p:mp e5b v1pldz u3mj 8jc8qw a.z2lowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allow p 3*fceizz )d7tlc,g*ur2,ov6dk 0osed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

Correct Answer:    
Mark Problem
15#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The neutrino has

Correct Answer:    
Mark Problem
16#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An electron is an example of saeqy jus:lbm4; +x2-

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an example okspuf l-sn*ikqd ;r6 /n:i)8h f

Correct Answer:    
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Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example -i, v(cucr;ezj l r;;gof

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an examplnqcu)3 ywa+8h *g+my ze of

Correct Answer:    
Mark Problem
20#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Particles that do not interact via the strong force but do he0zh)ezett9)6* j oainteract via the weak nuclear force (and presumably by the much weaker gravitation for)0*69 h) hzteteoazjece) are called

Correct Answer:    
Mark Problem
21#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Hadrons are divided into two subgroups callov 4)fyhp6 8xdvt hci )mvg(07ed

Correct Answer:    
Mark Problem
22#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A quark is

Correct Answer:    
Mark Problem
23#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What is the quark comlu+l3j66w d nbc9aeo5 position of a $\Lambda^{\circ}$?

Correct Answer:    
Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive feature of quarks is that thegfa 32 -kkiojhs,2a9hi0 ye;6l,iqpby

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks and antiquarv)8 b+8r3jm-n u*y r j1onzrgwks is

Correct Answer:    
Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or absorbs a gluon, the q(m,6y lgo .quxz58wml uark changes

Correct Answer:    
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Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types ofhl :o(0ywk e nk;*iyu; quarks is

Correct Answer:    
Mark Problem
28#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Which of the following is not considered t(ag-f1c qv q0uhiq6+h nvx09to be one of the four fundamental forces?iq0q xc0q1 htv(6-gf9na+ uvh

Correct Answer:    
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifying" the forces of nature was th s*wofw,x1g5vd4*aqrp*a )rpe discovery that two of the so-called fundamental forces were two parts of a siv5*r **gq)f daw 1rpwpo4sa, xngle force. The two forces that were so unified were

Correct Answer:    
Mark Problem
30#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The grand unified theory (GUT) is a sought-after model that wouck9a*w , s7.)dpvqonn ld unify three of the four forces of nature. Which force is the one it would n ,9no*w kcqdnvpa s7).ot include?

Correct Answer:    
Mark Problem
31#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What is the wavelength for a beam of 1.4 GeV epi3 kvjgicfaz4p95j94 1 y 3yblectrons?

Correct Answer:    
Mark Problem
32#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron operates at 10 MHz. What pz +rx3bjs,w7magnetic field is needed to accelerate protonp ,37jszbxw+r s?

Correct Answer:    
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Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m accelerates pmd1o. l(+rozu rotons in a 1.7-T magnetic field. What is the frol. uzo( m+r1dequency for the applied alternating voltage?

Correct Answer:    
Mark Problem
34#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m accelvcjn(;.dmbuaf-tax g 4y- 26 zerates protons in a 1.7-T magnetic field. What izb van4dm.-a x cytgjf-;62u(s the kinetic energy of the protons when they leave the cyclotron?

Correct Answer:    
Mark Problem
35#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A deuteron has the same charge as a proton s jquw;du;l53mw:t7ny6 yfu6but approximately twice the proton mass. Suppose deuterons are being accelerated in a cyclotron idnsuu:y6 y;7j u q5l;3m6wftw n an orbit of radius 75 cm at a frequency of 8.0 Mhz. What magnetic field is needed?

Correct Answer:    
Mark Problem
36#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Suppose you were to try to crea 33ygkob1ct6h y-,ywm te a proton-antiproton pair by annihilation of a very high energy photon. The protoyt3 owc1b6-3mky yh,g n and the anti-proton have the same masses, but opposite charges. What energy photon would be required?

Correct Answer:    
Mark Problem
37#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a positronium atom (electron + positron) d ms4eju-- bn3eecays, it emits two photons. What are the ene-b 3s4-ue enmjrgies of the photons?

Correct Answer:    
Mark Problem
38#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The pe meson has a mass of 264 times thj*8dtg2 j* jylqo7p (.53yv2 fllztguat of an electron. What is the range of the forcey.gyj2o(5j2 f7p*jtv q *tg8dlll u 3z mediated by this particle?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hypothetical force with the proton aski ty5qsvmw+3bnwx2// r b e634*bsd b the virtual exchange particle.v kb+ b*nd3/r26b w /te4ib3w5symxsq

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing +6(p im6k5cd5jw po jdparticle in the following reaction.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
41#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing partiw*v* ) gw)r(onbnff0p cle in the following reaction. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the qv) 2idz c 7oppm+5q:sfollowing reaction. $\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
43#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of quarks inutm; gw85 hq9z a deuteron ($^2 H$) is

Correct Answer:    
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