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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 okgpm:8vu:.g mq;,.a gpgs u( 5ndc1fc f a charged particle if its speed double aug1sc( pgg.c dm.q unvp,8; ::kgf5ms?

Correct Answer:    
Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the nq n.8 p/wlh t g b3yl)up5d,sz4x7y7lcyclotron frequency of a charged particle if the radius of iwxt8/q ,.l 7ns5)lylpyh dup 34zn7bgts path doubles?

Correct Answer:    
Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons approaching each other, interhj me+c4i26s kacting, and then leaving each other. What particle is being exchanged durin6sjie 2c hk4m+g the interaction?


Correct Answer:    
Mark Problem
4#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows th66f+/kbbqxstnq 7 .m he 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:    
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Mark Problem
5#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A positively charged p5p pnh9i )zxa8,d ,rxelectron is

Correct Answer:    
Mark Problem
6#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What effect does an increase in the mass of hqh pzi ,tot64b(4/zbthe virtual exchange particle have on , z4/ (iobtth6zhb4 pqthe 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 is t;5 a rh-hjmia f 5bvumj(.9c5ihe

Correct Answer:    
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Mark Problem
8#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particles for the weak forceec/itb kb jq5f(8l1y :,kl)k+kkrk8i are very massive (about 100 times as massive as a proton). This would lead okel8il 1i(+kk5k f qy,t8jbk)/c:br kne 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 call65*n3ef ual n:3 su f8vgt(ggped

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the speed of li dvg f;r0f n6-rfxm/x*ght

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 po v-c*)tk7*qd6qwtbreq ep5l )sitrons is that such a process -*c75pq6tbw)kqqv )e r e*ltdwould

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay permisv fkal4z8,o3w8qf/c .oa2 wot sible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowed? c4sxto:eb 90 ci/lhh,$\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowed? -ome s-7odo o+$\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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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 example o k)ymcl3y-- uw,3iqk:ewt3)ni zuuj 8 f

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an example ec .myg n3pw/*of

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example x)cdmu5ch( qqe/ h2u.of

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an examplef s;lv d8e)m-yw6i :mv of

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 interayn( qm5 en,:siva72k fah9r/gj* h,b cct via the weak nuclear forcb(jga 9h,s,q *2 r:hni5vc mane 7fk/ye (and 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 vqn7lja;w ,y ;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 compositiic .y)0dms mqxw. c b;feqpa13-.w*aj.safz :on of a $\Lambda^{\circ}$?

Correct Answer:    
Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive feature of quar 62(esxzn qr-qks is that they

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Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks and antiqhh1-6we4+agxd fronpq8bt ;-uarks 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 q fh+r6r)18q)qvv: lc( ulswdmuark 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 quarkag :i8zrk3r+ vs 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 crg 1 ha-x,4d ;)dinbqfour fundamental forces?1hbxdqni -acd,rg) ;4

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 discovm5bt/5 d8lh d/ 9 bu/0fwpzevfery that two of the so-called fundamental forces were two parts of a single force. The two forces that were so unified wet 0/lp udfe5 mv5hw8 bdfz/b9/re

Correct Answer:    
Mark Problem
30#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The grand unified theory (GUT) is a soughwzk) nwnx::ei2wt mvf6 ()hy(t-after model that would unify three of the four forces of nature. )wm6hvwwnye:znift x k: () 2( 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 fordf39ot 3w2 vgh 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 is needed to acc kdq+ .ehq*w-yelerate protonskqw* eq.dy+-h ?

Correct Answer:    
Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m accelerates protons i) -mq fafsl6iz (e64mun a 1.7-T magnetic field. What is the frequency for the applied alternating vo f(-a6s6 quzmfl) 4eimltage?

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 1.74+2d9pd00 dwp xf t /udf qxv;3zwv*ea-T magnetic field. What is the kinetic energy of the protons when they leave 0a 9 2epxftvdp+dvwdu4fwq /x z30;d* 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 approximately twiq7ms.+m+u f87fgm zjs9v0tc fce the proton mass. Suppose deuterons are being accelerated in a cyclotron in 0.7uf8tqsg mzs f7j++vcfm 9man 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 bynos 6k u;nr8)x annihilation of a very high energy photon. The proton and the anti-proton have the n n8r)ux6k so;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 (electroc b)8hc 8fqiylp1-):uv u.jl nn + positron) decays, it emits two photons. What are the energies o.)p -ql uy8chi cu8njfb)vl1: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. f:hpj*/u gv ,yWhat is the range of the force mediated byvghp:/,*j yf u this particle?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hypothetical force wn.jpidc / r4dcjha7dnxb7qz ./u1(3yith the proton as the virtual exchang1h(dxbyac..zi n7jcpj4/n udqr7 d/ 3e particle.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing partl2awq/sg(s ,9hi)y j3n j(qub icle 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 rea jaa1s1+u-afx ction. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
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Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particln,4hn ljjo 3(ov3 6erde in 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 5zd s) 3+5-+gsuo0 zmhcjt login a deuteron ($^2 H$) is

Correct Answer:    
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