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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 frequency of a charged particle if its soh7qns(z3 s( cso(l3zbna. 4rpeed doubl4o 7zn.bs s3ln( h3 o(c(zrsaqes?

Correct Answer:    
Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cyclotron frequency of a charged part5st :4t4wq tdnicle if the radius of it4wtq4 t: tdsn5s path doubles?

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Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons approaching each other, interactiw9k6k 7,lsxt mb43r ssng, and then leaving each other. What particle is being exchb l mk6s3k,wrxt9 s7s4anged 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 neutrinooxq8x+o*g8ex-s)f/ve z9ye rn 2 yy ;n ($\nu$) 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:    
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Mark Problem
5#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A positively charged electro,z ) :e sgjb:s+2o zm0nc-ysokn is

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Mark Problem
6#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What effect does an increase in the mass of the vir 4.y2sqne ,(z mvfrbdj :s/nl;tual exchange particle have on the range ofbs nn(z4yfjrvmql ;e .:/s2d, the force it mediates?

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the weakn kqgyg44q**dk4,dmi7 a+ytz force is 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 ma vvtsfpmpe+4 z2n8j+0ssive (about 100 times as massive as a proton). This would lead one to expect that the weak fosv+zv8m+nj0 ft 4pp2erce would

Correct Answer:    
Mark Problem
9#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particle for quarkscr84b wx, fmr: is called

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at o9 z; olq74ppfthe speed of light

Correct Answer:    
Mark Problem
11#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  One reason a photon cou3 6j+iy /w da/q*vlktpld not create an odd number of electrons and positrons is y+/*d laijq k3p/v6twthat such a process would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decaytk-n4*,q a(a xrq0 tss permissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
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Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decahh30e wnyn18by allowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
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Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allw uu2jlq3zzy ( k,e80mowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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

Correct Answer:    
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Mark Problem
16#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An electron is an exackj c e/*;rjd4mple of

Correct Answer:    
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Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an examp-ae2jq ejd 28jeb*d p0le of

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an exam+nwcdq 9 sd scw0qmt:quj hl(4277m,v ple of

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example 7 tgn1ll9xi v(of

Correct Answer:    
Mark Problem
20#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Particles that do not intera 6,yjq6,1nycto/9-xm *qrle xjq3sxmct via the strong force but do interact via the weak nuclea/smym jlx, x *1x-re9qyoc6,tj63 nqq r force (and presumably by the much weaker gravitation force) are called

Correct Answer:    
Mark Problem
21#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Hadrons are divided into two sut93) 9xpfs by9wz5g rz y lj/3zyzgu5,bgroups called

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

Correct Answer:    
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Mark Problem
23#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What is the quark coms s vnd(-;c2owv ck+8ywt o rt(c6-yv+position of a $\Lambda^{\circ}$?

Correct Answer:    
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Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive feature of quarks is tha27liitm fwon;4.v vwa:mx68e t they

Correct Answer:    
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Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks and antiquarkhw39;jode2 r js 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 quarkb-(dnn0hfh: i changes

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of quar5ysa/ ok7ckl6s*5xs7d,d dtu ks is

Correct Answer:    
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Mark Problem
28#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Which of the following is not considered to bl-jh a iz1 xw-d:y::dqe one of the four fundamental forces? yqdzw :1 h:-ia:jdlx-

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 the discovu62 srx-f. y 5d*gybzbu7b7clery that two of the so-called fundamental forces were twlb7r ucu72f yxdsb -zy5.*bg6o parts of a single 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*eb46* dxp0z*(djgw(tmx te u) is a sought-after model that would unify three of the four forces of nature. Which force is the one it would not include?x *ewt0dud(46g*pebj xm*z(t

Correct Answer:    
Mark Problem
31#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What is the wavelength fx lu/w)i..(6+ + ydufrjughxh ok 4h3 carw3;wor a beam of 1.4 GeV electrons?

Correct Answer:    
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Mark Problem
32#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron operates at 10 MHz. What magnetic field in+ngc 5kv;:sj s needed to accelerate proton+;knvjnsc 5g :s?

Correct Answer:    
Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m accelerates proton ,3)crdhfdh bs;/ms* ks in a 1.7-T magnetic field. What is the frequency for the applied alternatindrhk)s d/fm,;sh b*3c g voltage?

Correct Answer:    
Mark Problem
34#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m accelerates p(a9iuytqa 0g t9a.w; srotons in a 1.7-T magnetic field. What is the kinetic e;aug 9s.iaytq(at9 0 wnergy 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 but approximbis kuz. ah;c2/q,.enately twice the proton mass. Suppose deuterons h/u,a.zink2bcs ;e q.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?

Correct Answer:    
Mark Problem
36#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Suppose you were to try3hyvfeo :sc -) to create a proton-antiproton pair by annihilation of a very high energy photon. The:3s yeho-f cv) proton and the anti-proton have the same masses, but opposite charges. What energy photon would be required?

Correct Answer:    
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Mark Problem
37#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a positronium atom (electron + positron) decays.ips+lg dy + 2dkwpw;;, it emits two photons. What are the energi.kd2p+w+lg ;d; siwypes 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 that of an electron. What is the range4tu , dhv)jad c09cduw/9x2jt of the force med9 0dtuc9jv ,tdauc/ 2whxd j4)iated by this particle?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hypojpj18cq cn-glo 4 ;4 wt*(ggaqthetical force with the proton as the virtual exchange particle. wjpg alcj;gt8o(1c4 gq-4qn*

Correct Answer:    
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Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the fow4 ( x6obzse vay50ld2llowing 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 particle in thef( c d7j a/e*h9lhgkm/ following reaction. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
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Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the followih)aj e9b*6 ptj.bu vd:ng 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 in aq:)ccrcc j7 ywrh5:sc0kw97f deuteron ($^2 H$) is

Correct Answer:    
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