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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)ggtizw3m. (thkq:a; charged particle if its speed double t3iawg :g;k(t)mz.qh s?

Correct Answer:    
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Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cyclotron frequency of a chargedh.l ,3r2/.xzylem 3bj -noifz particle if the radius of its path doubles?j 3-liznbr zox./2 fymh ,3le.

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 approach84 svmkb1q nb yhf43q5f (s+cming each other, interacting, and then(cfs b4s1y vfm4hk mq3b+q85 n leaving each other. 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 weak interaction of a neuy y;/+ 8glgvtotrino ($\nu$) 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 k; 0*xul5j4zijsy- ru electron is

Correct Answer:    
Mark Problem
6#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What effect does an increase in the 9) 8(bz 2n dnmrazmze4mass of the virtual exchange particle have on the range of the for4rzn ed(98bm )2 nazmzce it mediates?

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the weak forcpa15 ,vm- .cxopy; kise 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 times as(h7n /wtisk:rm 11;ur*acu ak massive as a proton). This would lead one to expect that umn r71( tki rhsc;/:*wak1uathe weak force would

Correct Answer:    
Mark Problem
9#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particle for quarpg0f b(e (efr9ks is called

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that trave,v umnk4 7(-8 ;dw:pckcy dcdils at the speed of light

Correct Answer:    
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 isyr-kfm/*,v14vhp cm txov2y +6w2jin that suchy+ v2hnwv, i1o6j4 2kpmtcxr fy*m /-v a process would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay permissib)) 4src-gzij5ed;ua dle? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowed? 7abej0d27 bf2h;agrh$\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay yq/y -c+uptz r+zakt:*pr uy. g8f1p0 allowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 examprlk/ 4rcu ufrl m80/k,le of

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an examplexd *7 /k00.leilbfagk of

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an exam1dda w lmm4gckc+:)z0 ple of

Correct Answer:    
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Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example uemcvl nc :1qf(.rewqb9 :u1*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 interact viam7 9glpe0 snhv1py ;.(avljwgb3 3;xr the weak n 0. j(a;nhpggp7x39lr;s31e vmyl vwbuclear force (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 two s- b.dyf k9/guo)cojl+ubgroups 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 composip6la-dtxn: ( a;yy+8+nag sprt6wnj* tion of a $\Lambda^{\circ}$?

Correct Answer:    
Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive feature ofi5 um-p,fgwvz,zk xhy(c1-r/(8yy wk quarks is that they

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks and -;y)pzddg4mnxgqa 4 2-l 8i ftantiquarks is

Correct Answer:    
Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or absorx+m jgx3f c,t(bs a gluon, 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 oc:u*ikg f-o+exf cq0 f1 qd8:qko;xl 2f quarks 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 theb:36s lyeo k0ju*f)mr four fundamental forces? )s6ym: 0ob3l*ejru fk

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 that tbzby2 (i;inhig,q02aetqk)h qb))k 5wo of the so-called fundamental forces were two parts of a single force. The two forces thay)b niqitqe 02 h;i2gka)b5 (bhk,q)zt 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-d fi5g8k0n:g) n*zb86: xj bakgwrwd sought-after model that would unify three of the four forces of nature. Which force :af gd0dk )g6nxb5w :-nk*g8i8zb wjris 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 e5i 8c t;wshu2electrons?

Correct Answer:    
Mark Problem
32#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron operates at 10 MHz. What magnetic field) f7ojp- 6r2 jvq3i+jeh rjs+e is needed to accelerate protons? j6vf-q+iroe 2)e 7ph+s j3jrj

Correct Answer:    
Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m accelerates p+o 9yu988mwxjc3m.i y qbf,wjrotons in a 1.7-T magnetic field. What is the frequency for the applied alternating vo wj93 j uwq 8bf9y8c+oxmi.ym,ltage?

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 1.7-T magn gks5w:fha0sl5n p0*ketic field. What is the kinetic energy of the*nh5 sa g s:klf50w0pk 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 as a proton but appc 9*;cytuc1 ci, dboh-roximately twice the proton mass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75 cm at a frequency of 8.0 ;91idc *bct ,- occyuhMhz. 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 ofjkyx*18f :d,rhvaz(* hfj s(u6t h1yo a vez6rjuyh( k ah xthy1(s jd*fof v:18*,ry high energy photon. The proton and 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 + posit ejs+sn-px kfxz*08 04 u9kbftron) decays, it emits two photons. What are the energies of the photon- k xjs9ut40 *sfz+xne08pf bks?

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 the raua.q; b.m3jo,i b2hq mnge of the force mediated by thiqm;2h,q3b umbija . .os particle?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hypothetical force wi nlup295jb qo4th the proton as the virtual exchang4 2 b5p9jolqnue particle.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the foblbr e.xx/s1.j3: w kvllowing 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 followingktzq: *-m; 0,yrif9kg zu ed3x reaction. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in thel n.h/73(6qe7 (yrr c+ee s drdgzrigk 3jd2h/ 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 deuter xvc+vyy,pk2 /t7lchm)kld9 ) on ($^2 H$) is

Correct Answer:    
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