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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 cz+)orc 3j69yicz g +fiyr*mg7yclotron frequency of a charged particle if its speed doubly7c9y z+io) g*j3+irm zg6rfces?

Correct Answer:    
Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cyclotron frequency of a charged d-nq bl 5-vyp1r +s9woparticle if the radius of its pa1-ps n-5+vbdlo q y9wrth doubles?

Correct Answer:    
Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons bn dmw),u +(oy4vmk: happroaching each other, interacting, and then leaving each other. What particle is b:+b)nk v4 um(dwyhm,o eing 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 hxm41mw,5 ihgvp u0e9y n* ft/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 elect0xosvs 8q3f *lron is

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Mark Problem
6#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What effect does an increase in tg+ zop0* dljt3he mass of the virtual exchange particle have on the range of the fo0 gjp3 +lto*dzrce it mediates?

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Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the weak ijq cgrq4,qrwosw -j( 3:3 v)oforce is the

Correct Answer:    
Mark Problem
8#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particles for mm*g )60v.xat j4v crpthe weak force are very massive (about 100 times as mar 4am.*gp6 x)tmjvcv0ssive 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 cagvd n0q.l(,n 4nrsaw)lled

Correct Answer:    
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Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the:ri0 mjk: sf*to sstji-.p2 j0 speed of light

Correct Answer:    
Mark Problem
11#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  One reason a photon could not 7nnogp yb ab0(- hoxe 4rt.36screate an odd number of electrons and positrons is that suchrb(6nyhbpx .a-go 47 ne30ots a process would

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Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay permissibl j3z.pichkc+ j: 2;3smwdtu p*e? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowed?8dsuatce+yfp t; .-ij+r.l 9s $\Sigma^+ \rightarrow p \;+\; \pi^+$

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Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decaf65bu2 qdb doi8r9m8 sy allowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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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 examkt651 w jxy0nbwu7- zlple of

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Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an example: :s3 jgrkfmaha h1))t of

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example khc9t + : *pkb,6yp; idlm./-hslowra of

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example vl2 ,egjy7io:mnt )7wm:knc g9 .xo3 iof

Correct Answer:    
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Mark Problem
20#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Particles that do not interact via the strong forcezi p5t- 5a )lsn/,0(bav crlp8lzr ,dc but do interact via the weak nuclear force (and presumably by th5l s8 rbpcntvdacl0zl5r/-,za),p i ( e much weaker gravitation force) are called

Correct Answer:    
Mark Problem
21#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Hadrons are divided intozw3zyoc: b -n3 two 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 composiwv4n0 yb o)2eoxlf,u9tion 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 thb*qc0c+hn /,splzh2 tey

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 ant,jeqlz a0pn3 s 47ve8tiquarks is

Correct Answer:    
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Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or absorbs a gmalfs m/m.d6; luon, the quark 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 quarsl;yw;jj3gr, ks is

Correct Answer:    
Mark Problem
28#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Which of the following is not considered to be one of the four 3: ugyawip*b 9fundamental forces9pyb3g: aiu*w?

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 discovery 9 onl+ u5qcb0jthat two of the so-called fundamental forces were two parts of q+ 05uj cl9onba 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 wou ed5,b3j 7zds7s8 pnom 7oro1k bmu;j+ld unify three of the four forces of nature. Which zrpo7b;5 8ouk3bj o +ses ,j7dm7nm1dforce 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 5u xmcefum; c,;w1u8k for a beam 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 .9j eb,utiwktk-u) c9is needed to accelerate protons? t,.9wc-ik9kt ) bjuue

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-T magnetic field fu9peqv/ 7.oq memha345xbm9. What is the frequency for the ap9 a .f/eep hx vumo47mm5q39qbplied alternating voltage?

Correct Answer:    
Mark Problem
34#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.w1sq0 -2 5oobs0g k83dbjfpfg25 m accelerates protons in a 1.7-T magnetic field. What is the kinetic enp gs1woojf kqfdbs0g-b 50 832ergy of the protons when they leave the cyclotron?

Correct Answer:    
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Mark Problem
35#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A deuteron has the same charge as a proton but approximatel-nm )za6nagsm,5 6 ppgy twice the proton mass. S6p5m,-zamgg npa) ns6uppose 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?

Correct Answer:    
Mark Problem
36#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Suppose you were to try to create a unp:j //w3 5feiy6raiproton-antiproton pair by annihilation of a very high energy photon. The proton and/ap 3e:6 junf/wr yi5i 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 + .xtgl/ikr. mh mn4 4q8positron) decays, it emits two photons. What are the energies ofq/ gmih4. 8x.mkr 4tln 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 elecp- *c(s9) jjwfgnhn/*;y elsutron. What is the range of the force media-hgws cjen * ul)sf( ;p/*y9jnted by this particle?

Correct Answer:    
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Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hypothetical force with the proton as thet3 z+)gi:m(nff9 cblr virtual exchange partmf9tncr lz+3gb: )f(i icle.

Correct Answer:    
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Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle kz fm(2y0y l:ain the following reaction.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
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Mark Problem
41#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the followq (uj,hqmr8hbw9d,h/ ing reaction. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in+w*dsht/5gjahv8y(fgx / g2i.h, uke the 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 dea//jjg/s 5hhf9)8 fth9ldzd e uteron ($^2 H$) is

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