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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 sp0 uv i/)ag.pq,nlz2co eed doubles? zc n)l/qoi,g.2 pvu0a

Correct Answer:    
Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cyclotronqv0m sj1 l cx)ue r7e3uo 1(z6.oyae/d frequency of a charged particle if the radius of its path doublem zucrqvdo ()11e63jou x.es/0y7 ael s?

Correct Answer:    
Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons approaching each other, interacting, and3v:7b2n u asro then leaving each other.ras73vn :o2bu 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 weak3sd7 tx4xx/ph 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:    
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Mark Problem
5#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A positively charged electron adpumel--)pb,y r+pu b 0/4 : lepwp,gis

Correct Answer:    
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Mark Problem
6#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What effect does an increase in the snf2-*bb d) grmass of the virtual exchange particle have on the range of the force it mediatf*d )gbs2n-r bes?

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Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the weak f(9 y:t. ged ,0hzuiwtporce 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 massive (about 100 tqn 3z2fwy 2k9uimes as massive 2fyzw9 2 3qnkuas 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 quarty -ia67 dgyg9d :pxy8ks is called

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels d0sq5- g8iont: lya h*at the speed of light

Correct Answer:    
Mark Problem
11#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  One reason a photon could50 6(pph qx 8o bf. /n+9,ttudmczjlmh not create an odd number of electrons and positrons is tcnh(pq,oz5u xpmtb/89 + 0tm lhdj6f .hat such a process would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay permiz,p+ba zc1eu+fzmi )))c+e ba ssible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
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Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowo+kfu (ahm u-gqm9fa3/lh l76ar 7v- ned? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allz;2 fk,, khl ima1g,ec7bu)dzowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

Correct Answer:    
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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 exax2l/2ob5 bb 8nlq8ble8;xtoi b2sp(emple of

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an example i00ec uw,*cje s8 alxsn7hu3 6of

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example ofliqdvv6/job.hd a)*pvfd 0 is:x;05b

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example - -o2m4jv:rxhdw6w l x4,iaajof

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 interactsm-nr4wfx; 9u :nkn3z via the weak nuclear force (andurmwz9xn: s; n3n4-fk 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 twiz pnp lm;m26p+5ndkmsp 8 w(*o subgroups 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 ra xguo37:ms5z )pqs*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 b* r+a t )n)ravj xr4juk .nos/.k+l6iqs a1;fthey

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks anrd 3:fl l7lr g w/(vkt/8bywj.d 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 quarkp ltj b*d);:pn changes

Correct Answer:    
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Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of qua5 qtr .dw0a mv ym60vf*nt:.lcrks is

Correct Answer:    
Mark Problem
28#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Which of the following is not consideyoe b - lpz5plxl -7osc8,p6*cred to be one of the four fundamental forces?,8c*lc llsppbzpo o--y5 6xe7

Correct Answer:    
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教师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
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "db. n9d9jvm +8 ofz6aaunifying" the forces of nature was the discovery that two of the so-called fundamental forczb996a.d+8 davfn mojes were two 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) is a sought-after model that would unify thrb(44 h4 4i1rvtyofdkd rqe., iee of ttv ydb4k4.4doqir, ri (1h f4ehe four forces of nature. Which 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 bea + ub:akssuh-2;qmaz*2wjw n6met3hzp (p 2* ym of 1.4 GeV electrons?

Correct Answer:    
Mark Problem
32#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron operates at 10 MHz. What magnetic field is needed to acceleaocbald ; .07dv4 kiz31/c jklrate protons?07jido la43vckbd.l/ k ; 1zac

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 acceleratesw7mie1l 5 ,beu uy05wh protons in a 1.7-T magnetic field. What is the frequency for the applied alteiy7e ub0u,h w5mlw15ernating voltage?

Correct Answer:    
Mark Problem
34#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.2cg+;ruupn:l ee 00+,yxnp bf75 m accelerates protons in a 1.7-T magnetic field. What is the kinetic energy of the proto +ep0gepb,c x0rn;unfu+7:ylns 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 c.(cf ggk4d s4*qpfhe3harge as a proton but approximately twice the proton mass. Suppose deutero *kecs4gg fp.qf d(43hns 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:    
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Mark Problem
36#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Suppose you were to try to create a p0v,48*xrsga;hcgx,. awzafvp(v :l a roton-antiproton pair by annihilation of a very high energy photon. The proton and the anti- (sa.wg,8:xgla 0zvhvf v4*capxa;r,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, it emits two photons. .4yb; ; niiz- yq:qdyk What are the energies of the photons:4 i-yz;k.dyq; yqnbi?

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 elect1y)d fks/v4cn ron. What is the range of the force mediated by this parti/fy s 1vcn)dk4cle?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hypothe1jbo3qx s)c6d e r0o5ltical force with the proton as the virtual exchange particl c035esdxrj1)o 6oqb le.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the followinw 5 dy xbgy )gdzw,f;-88tfl-kg 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 yxie 1 nm6e2 mvt12*wqparticle 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 followb;yn fmv0e(yfl0 .l.ping 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 deu9,g ywa3y-ex53ixv;4 csu qwoteron ($^2 H$) is

Correct Answer:    
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    Total:43 mks Pass:25.8 mks Duration:Unlimited
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