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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 irez fmzd95p+p,-srx 7 f its speed doubles?zpm,r+ds x- rpez597f

Correct Answer:    
Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cyclotron frequyoyj360 qe 5gpency of a charged particle if the radius of its path do3 e pogy0y6jq5ubles?

Correct Answer:    
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Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons approaching ea w)zailk* b+ey1ct -,gch other, interacting, and then leaving each other. What particlei ),ly +agwb* 1tzc-ek is being exchanged during the interaction?


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Mark Problem
4#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shoyf ghdri-*a( 9ws the 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 electron i8lqx h6vaxhp a/2n:w 4s

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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/3 4s,*cu6haidf 7uwqk9 zzvk of the virtual exchange particle have on the range of the f,w7s4/uki ckvz6aq93uh f zd*orce it mediates?

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the weak force is the2 knbbogd )-r)p(cda e04qk,j

Correct Answer:    
Mark Problem
8#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particles for the weak force ::bfu:(gdrrobu( ppz we/qq64 p(7jh are very massive (about 100 times as massive as a proton). f:/(4( rp hdobg:p6j(zqw :qebuu pr 7 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 particlv odzn8arx9j1o(6 p7r e for quarks is called

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at thoajrz0m6 (dnk(b, zf-24af use speed of light

Correct Answer:    
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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 positrons 3e* ds0tg4xlk is that such ke*d43lg0 xst a process would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following deca2nbw k-.xb6 ab2i:w(i w4agqr y 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 allow 4+yc1bmkuc+v ed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
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Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowgg6rura;lq g/6av 2n(ed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 exampl6qiz3gw6mwwj2d u d;i d(z/7ve of

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an examplh cw/7q7z4 )etd0ns he4tw6 vbe of

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example of .c -wzemth4r8

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an examplhabeq0l* (4d7nsa 6xme of

Correct Answer:    
Mark Problem
20#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Particles that do not inexekv8,se f6bm)zj 2w0i; ap*pcg ,7kteract via the strong force but do interact via the weak nuclear force (and presumably by the much weaker gravitation force) are cale)pw;i ,je ascevb6k g z0*2 ,8pfmkx7led

Correct Answer:    
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Mark Problem
21#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Hadrons are divided into two subgroups call* galosst 3w2g gp 3-yp.dl7)oed

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 composition v e;5w pt3.7f0tkt 8god zzxv4of 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 t6eut- leamf:3x0wk 9 b,z7rnl u7jsc )hey

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 antiquarks istg.xf -+u p5qu

Correct Answer:    
Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or absorbs a gluon,m62xoih0b7zl+ ,cmwa the quark changes

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of quarksi7b+hj d ym-e5 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 foul+l 8az (rffqa5e p4n:.o rs4er fundamental forces4qan(f8 l:spora +.z4r le5 ef?

Correct Answer:    
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "un7b+ (zuimgrq7 ifying" the forces of nature was the discovery that two of the so-called fundamental forces were two parts of a single force. The two forces that were so ubu (zmq +77rginified 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 unif0kflnv )3f(lv4s,o q hy three of the fov l 4sn(,3 0qflfko)hvur 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 beam of 1.4 GeV eo5e: aky8wglml1p:i g6b wy .3lectrons?

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 magnetvd0,, )hmohc 4g:oqjeic field is needed to accelerate protons?edocjm0g ,vhh4)oq ,:

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 protons in a 1.7-Tcu-j.q ( g2 utbnx;dw1 magnetic field. What is the frequency for the applied alternan( uqdu xtg 1w-;c.j2bting voltage?

Correct Answer:    
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Mark Problem
34#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m accelerates pr+pocub4wg8 jz.a s ::eotons in a 1.7-T magnetic field. What is the :u4p+b8.g:j ao zsc wekinetic 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 samec aoi3)n 3df,q charge as a proton but approximately twice the proton mass. Suppose de )3qa ocn3,ifduterons 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 k y70sf- uwal9 moff-/proton-antiproton pair by annihilation of a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. What enelkfa9m -yuwfs- o7/ f0rgy 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) decays, it emits two phot )xkeq2ps,vhh /pii4hjk: +7tons. What are the4 expp/h7s:,+)ijk i qvh2tkh energies 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*(3yc bntekzd1t4h ; c the range of the force medynckc 4z1 deh3 t;bt*(iated 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 as the virtual egmqxa )q).04z3rll.nvbg g+exchange partic.b.ql 4r +3vxgm)zn)qea gg0lle.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing pajr,)y7+uyhj j qz( i33 ,qmwwrrticle 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 ril7x(ebx(fjj f p*5: krn:m a)eaction. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
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Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in e, d.o-ntqm:nqc7+hvthe 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 dz 1; lp h,,di)tphvlq/euteron ($^2 H$) is

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