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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 p 1(n.dxbxctwkap p jf+6 m;.w*article if its speed doublesb fppt xcka.6*.dx+ wjnwm;(1?

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 charged particle if the radius o-a 7k60 gy2lc 8c uzgck3cb5fzf ig 3y-k26 c58ca0 gfkcl7ub czzts 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 io(jbc,9bf)cpg 6w j7approaching each other, interacting, and then leaving gj)c(ow9pi7j ,6bcfb each 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 h0m5(br+iew lu;lbuxkr e14(+;s tyi weak interaction of 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?


Correct Answer:    
Mark Problem
5#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A positively charged ele ubmi1afhd il4 w .6p8n75n(zpctron is

Correct Answer:    
Mark Problem
6#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What effect does an increase ini;nh-l:j qa*ae q8 v)x the mass of the virtual exchange particle have on ti-*e qvn;xa)ja: h8ql he range of the force it mediates?

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the weak force .s u ,dwo6sy/ois the

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Mark Problem
8#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particles for oz 4+x fv9(nvejy e,lhw(9u,r the weak force are very massive (about 100 times as massive as a proton). This would lead one tou4e9, xjly,ro(9 (nvzf e h+vw 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 quap5m4jyb31q2b 6hnrbjob .lrzw 8-( n orks is called

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the speed of 2npk qsm*dek;3fx6/8 u m(.+uccodhs light

Correct Answer:    
Mark Problem
11#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  One reason a photon could not create an odd number of electrons and positgl 34ttb2ycy0. 2b udarons is that such a proct gyd3ucyalb4 0bt.2 2ess would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay permiss+op+ 0iqir *cmible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allpmv, i2 ynlo :zzdf8*a b/ga:2ijo;f3owed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allow9jyn1u:gs v,ded? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 exam9k g(vnpot1l kq :4l/uple of

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an example of-o,0 -xru hnuz

Correct Answer:    
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Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example78q--j /0k z-lcerz8f hmwf al of

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example oil8 bo(v np27pe 6ho8of

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 interact vie(s -et(z tx+ea the weak nuclear force (and presumably by the much weaker tz(xe+ ete-( sgravitation force) are called

Correct Answer:    
Mark Problem
21#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Hadrons are divided into two sa )od p(rz,pa.z4o4fq ubgroups called

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 composition of j 2 v4 3f;i1b.eznsjgra $\Lambda^{\circ}$?

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 thy rd6tb79pb,tr b(p;eat they

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quls1p7 idl/is2u mqy(*arks and antiquarks 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 quark changhm b ubel9l/ilc*zs4 i.uo-9: es

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types olo ,zw8ll32dgf quarks is

Correct Answer:    
Mark Problem
28#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Which of the following is not coneb6g1el6::fh yx u)grsidered to be one of the four fundamental forces?rl gy)hee: 1bf :ux66g

Correct Answer:    
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifying" the forces of 2e2xp2 n9ayk qnature was the discovery that two of the so-cal 2k qnyxa2e9p2led fundamental forces were two parts of a single force. The two forces that were so unified were

Correct Answer:    
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Mark Problem
30#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The grand unified thec8( 22jovrz yo r( 7cruitf7nr *xmr8,ory (GUT) is a sought-after model that would unify three of the four forces of nature. Whicnr vc2 8ucrj rtyx(o,fm287 7izr o*(rh force is the one it would not include?

Correct Answer:    
Mark Problem
31#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What is the wavelength for a beag+pawy0 59+9yw kshf yb(av0 fm 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. +6dwlpc )u ep*oa;k7r,oa8 sn What magnetic field is needed to accelerate protons?kws;p )oa+ucnrae 6 l*7pdo,8

Correct Answer:    
Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m accelerates protons in a 1.7-hwe)5yix 9d3k 3x5zba T magnetic field. What is thkz5 yxa39 iehwb53x)d e frequency 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 accelerates protons in a 1.7-T magnetic field. Wdbuf;i(q)knpnx9 aqf +j v;6+hat is the kinetic energy o +6n ff k+qq(x;ivdp 9ba;jun)f 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 approximaw3ci lng -b95 s1jpi4xtely twice the proton mass. Suppose deuterons are being apbs5j4 ix 93i1l-cw ngccelerated in a cyclotron in an orbit of radius 75 cm at a frequency of 8.0 Mhz. What magnetic field is needed?

Correct Answer:    
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Mark Problem
36#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Suppose you were to try to 1 ftmo2vg8fi2 create a proton-antiproton pair by annihilation of a very fv8ift22m1og high energy photon. The proton 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 (electro34.8hf ehgbe0+in beu n + positron) decays, it emits two photons. What are the energies of 8ub i0+gnhfe. 43eebh 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 thats2zvbxy.s /.c:fwyof1dx.s 0 of an electron. What is the range of the force mediated by this particle?o zx.2v/f b. s:ys.0y fscxwd1

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of8a c;5 ns40kjw(olu)o:znt zh a hypothetical force with the proton as the virtual exchange par:zh(k 5no) jlz8 4 uscwatn;0oticle.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particlez-5aortdo d5:o j(j3eu :9cwm 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 particle in the following reaction. 6m 6j: terbw3g$\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
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Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in igjhvm kqx1)* 5, ,*tzc4uj idthe following 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 a dq;( rtyz/ ht-oeuteron ($^2 H$) is

Correct Answer:    
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