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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 pyq );hcwui,n mt55,()fkbuy b article if its speed double,t,);kc y5bw b5hf)muni(quy 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 charged partitx033pi +kmkjohr:;dbr 4 n,bcle if the radius of its path dnok j3mi:h; , k3d0rbrptb4x+oubles?

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Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons approaching each otherb1ywa0y,*zfa8v* mu y y22f pa, interacting, and then leaving each other. What particle is being exchanged during theyyvf8aa bzyyupfwa 1*2m ,2*0 interaction?


Correct Answer:    
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Mark Problem
4#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram w8/mnf 3f9/,czix re ushows 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 elec 5tpxvl4je j8o 77ekp-tron 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 of the virtual exchang 18skf**xicv yppi+j( e particle have on the range oxsipy (* *i81kcfjv +pf the force it mediates?

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for; y-v 4/op,c0qqa(p ze h+yhhm the weak force 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 veru+xdr() 3 oazhoxy k.k7i /v2qy massive (about 100 times as massive as a prod /zhu2o.o ia q)3(vrk+yx7xkton). This would lead one to expect that the weak force would

Correct Answer:    
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Mark Problem
9#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particle for quarks is xch/+m9kqc;; hw3g /lh myse9called

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the v;md9 1gx3y yub u1i0o2ljj8tspeed of light

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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 io2n*qm4d htc spql -*mq+wg4 *s that such a process w- 4s4dqmqmo2*t hwn g*cp *lq+ould

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay ;ttut ji;p1fxma q5 98b(m7h apermissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowedw56qyc cw 7 186mqn7wqlxm c :1bf8uja? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
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Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decku lw gu6t+ ,al:gow*2ay 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 exampjj4fe2ht rh1hor5ouqqu - 60. le of

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an exampl3bb vbsn m 5,xvxd5::je of

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example of . m;.rwlz(3 j:5o- wnxhoaeet

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an exampley::tawm sl5;r of

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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 fgg k 3:3u)kdwk *t 3k*e*vd6vhefh4f via the weak nuclear force (and presumably by the much weaker 6**dk f gvev*kh3etgu3:4hwdk3f k)f gravitation force) are called

Correct Answer:    
Mark Problem
21#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Hadrons are divided into two sud64bn98p-5f0s 0j;k2gjgx ov madnc 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 compo+2y6.kx5 dsumxfri n8 sition of a $\Lambda^{\circ}$?

Correct Answer:    
Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive feature of quarks ifuijj8( l9xll)pf-j,0ctw d )s that they

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks and antiquarks g .o,6lj0/ucn:jpr nois

Correct Answer:    
Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or absorbs a gluon, thegtkbb urs1ti 7*am;fm 8j: 1f( quark changes

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of qujrus1v-zi287nu-j 3xq wu kik -bw;z-arks 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 7ulbo-k1d4h l of the four fundamental forces 74bduh1klo-l?

Correct Answer:    
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step ilz,(eqpzf t s-d:u4c3 -v)zp hn "unifying" the forces of nature was the discovery that two of the so-called fundamental forces were two parts of a single force. The two foz-phqve:d- t(u4zf ,3 p zlc)srces 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 unifrnkb 5/bf8ic/exe(pl7zn3* ay three of the four forces of nature. Which force is the one it would not8n/n *pfribz3xk (75ac e b/el include?

Correct Answer:    
Mark Problem
31#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What is the wavelength for a beamqi 2h3x4f9a an 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. What magnetic field is needed to acceleratekix(5av(*h ngcn .l,h proto kg(v,xc* hnhil .n(5ans?

Correct Answer:    
Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 md xb, 46g/szli2u6wytvg ukv gz.u*13 accelerates protons in a 1.7-T magnetic field. What is the frequency for the appliuvbz6xgyk g,ug sv*tudw3z1l./2 46 ied alternating voltage?

Correct Answer:    
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Mark Problem
34#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.2l5ib4bz5m7zp62x iq2 i:tx kz 5 m accelerates protons in a 1.7-T magnetic field. What is the kinetic energzik2x2zbi lz :4tp5qi 5m7b6x y 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 as a proton but appr .d 36mwapm:o6lkng 2roximately 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 d 6ml:mnr goa6k32. pwMhz. What magnetic field is needed?

Correct Answer:    
Mark Problem
36#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Suppose you were to vxy:nm7k7fxbf vu :s4 rc/bh);t 0o:qtry to create a proton-antiproton pair by annihilation of a very high energy photon. The proton and the anti-proton have the same maxrmxfo k)q b747tcvuy /b0f:;:vnsh :sses, 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) deca gvpni-yx:9wyx -,n-zys, it emits two photons. What are the energies of the photz--yx9n, yw x-np vgi:ons?

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 1f ;)yre-fi yth8oc vhg6/wu(of an electron. What is the range of (y- r); ct8ifvyhow 6hgu/1fethe force mediated 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 n w:j ut5rv+q(.mpya 7proton as the virtual exchange partj wt(:7py m.u5q vrn+aicle.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following reaction.y /:rx5 j:u 9:rna ljansh)0;hj:xbe t
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
41#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following reacj x(yl5 ,o1atyzw a4m gydc5mj- 576bjtion. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing part yp*bk0,se8 ir)tv: xuicle 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 3yq x*u: ayl y7i3nzoom1*)ew in a deuteron ($^2 H$) is

Correct Answer:    
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