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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 ypu; ll)d/b b/speed doublel/l)p dy;bbu/s?

Correct Answer:    
Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cyclotron frequency odue1a vvb o5a3 q54q2of a charged particle if the radius of its path doublv5oo12q4aaubd 3q5ev es?

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 eac4gz)2qjcxggf /fhz:5 q * n1qgh other, interacting, and thqzjg1 *c5gnfg g2f x4q/):qhzen leaving each other. What particle 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 shows-67xikx:77 qvu eavli+p d 0qa 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 electrowffd65ghb(k5 p d8p: gn 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 e-qys+fu sm36of the virtual exchange particle have on the ranys3f6-sueq+m ge of the force it mediates?

Correct Answer:    
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Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the weak force is thuq6n8q82jtz;+tcrh hf ibc4 )hm c7+oe

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Mark Problem
8#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particles fot*1f.jw2o zl yr the weak force are very massive (about 100 times as massive as a*fyl.2ozj 1tw proton). This would lead one to expect that the weak force would

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Mark Problem
9#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particle for quy6 yk:qu d2rw;arks is called

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Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the speed of lir.3 zwvs(jbr:*qs: zj ght

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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 numz:ur07p wy: ko/5lhz uber of electrons and positrons is that such a process would5pyw/uz:z u k7h:lr 0o

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Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following deca0ey uep9c5cddp-9d, y w ,-na9oyf b4oy 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 decay mop)ygn2qm,7 e)jw60gk s em: allowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowed? ,bqbu ve-.wbw 0;bt:* itu:u9b3mub d$\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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

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Mark Problem
16#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An electron is an examplcgdp 9bd. gatz1i-p 3(y f9oy7x (e1sye of

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Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an exampl6-*2pusjqu o2s4zr4 h :bjwzet vpj3p 76um0ne of

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Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example 2.s6hbl v;hsuof

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Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example ofubj9t :8ihzb3t 559z6sphq bq

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 force but do interact vq.j6fvv,77 u8w da2n qj qbv-iia the weak nuclear force (and presumably a77jqb28qv d6uqjnw f-. v v,iby 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 subg5d ccjvzlmu/ 0km/g52roups called

Correct Answer:    
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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 compos 3-p1zb1vazqi ition 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 gfj8y m)j; qnadm- n/9 r86bcvthat they

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some q*7u:luqwenp nttbgl* y71ru27 /oxe0uarks 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 m2t, uo-e 0/- y0zj3dr v8mh fw0uxpkhgluon, 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 o1mi;qkt7yj vyw5(rms2 ux+ h9 f quarks is

Correct Answer:    
Mark Problem
28#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Which of the following is not fklj79n q kf7 of-wvl/qxto;q2m4/4m considered to be one of the four fundamental forcewqlnkl4o-7vj9;/2mq7mq ft 4/ fkof x s?

Correct Answer:    
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifying" the forces of naturu8md:9 :nji7t-i2x u)qlu f in8o jw -nt/ur2we was the discovery that two of the so-calle2 : 2i8o-dr-fx/wu u l:7)t uiqtjnnnm8wuij9d fundamental forces 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 thtyp1 ax,d,(pem 7r:jpree of the four forces of j, y mrpd(71:,aeppxt nature. Which force is the one it would not include?

Correct Answer:    
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Mark Problem
31#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What is the waveleng+kuamn8mr6y / 33ts syth for 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.nz8e1 jr/q:lx What magnetic field is needed to accelerate pro/jl :xzq8 er1ntons?

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-vvtt 6( qg ,hdhb1v9yvp3go 5.T magnetic field. What is the frequency for the applied alternating voltagg,dv6hohvt 3gytp.vb 5(19v qe?

Correct Answer:    
Mark Problem
34#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m ac) :l 92hamwq tj-1kidbcelerates protons in a 1.7-T magnetic field. What is the kinetic en q-1khli t9:2a)m bwjdergy 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 as2jf ;,zaf v2go)mq nt7 a proton but approximately twice the proton mass. Suppose deuterons are bei,;gztvf7mq)foj2 2 nang 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 proton-antiproton pair by annihilation+ tz3z 26usok-xm rfw fb5u1;a of a very high energy photon. The proton and the ant5r 6sw1a;mbzf-+xf3 2u touk zi-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 + positron) decays, it emits t2n9n 3w0u2 sqri0drg 4sf1(v.td q qjcwo photons. What are the energies o 9gcw.j siqquqf4302vrst 0nn(rdd1 2 f the photons?

Correct Answer:    
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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 range /u 4r..vh 3zw lapehpr(s45ag+r gzf9of the force medialrea szr/.pah45zf 3u r4v.( 9g g+pwhted 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 wi9(8mf9 *ipb pa-ie h ,d )rh5/bgd/tnuzk(ncvth the proton as the virtual exchange particlez c)p5hg tbvkembii-dh *(,9dnau// 8pf(9r n.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following rg rn*:o kjjd..(0nx udrr:pg1 eaction.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
41#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following reacti,3zj.9s d ,yltno 6ocgon. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the followins *b7n8h4bc+1 o sttzxg 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 deuteron (- +tt mda8,4qdsi n qdl1l;op1$^2 H$) is

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