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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 freque;sb(ubda 8f2 zncy of a charged particle if its speed doublbs(f;d2ub za 8es?

Correct Answer:    
Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cyclotron frequs2pmf8tx0uys87tfmg).q 4 twency of a charged particle if the radius of its path doublesxuy4.mt0swfs q8)28 m tg7fpt ?

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Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons appr7jp:*)mpb xttoaching each other, interacting, and then leaving each other. What particle is being exchangem*7: pj )xtbtpd during the interaction?


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Mark Problem
4#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram sj23vu o.f 2, 7oi4n1d uixewldhows 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?


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Mark Problem
5#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A positively charged elqqr. 5mc:x;dt ectron 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 exchangx;1 6m +n kg zv p3wyo(ldhr;ub,uaj/-tn31ece particle have on the range of the force 6b ;+uxk vat1noe gunlwc(d;m3-yhp/ j3 ,z r1it mediates?

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the weak f dvvw::gx0s *s ,h(hvsorce is the

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Mark Problem
8#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particlnwqz9y98k,cax5w j t4fj w/b- es for the weak force are very massive (about 100 times as massive as a proton). This would lead one to expect that the weak fo cz8 wqj4y/,9w9kt aw-jbxn5 frce would

Correct Answer:    
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Mark Problem
9#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particle m 4zrg5v 01;os .l8bovzlq,jef iq1z( for quarks is called

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the sp,dmzuh w-d c.8eed of light

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Mark Problem
11#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  One reason a photon cz xe*s04bg(x :ncd4yp ould not create an odd number of electrons and positrons is that such a process wncgzd(b x y*04:x p4seould

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Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following deca6j5:ey.kax hcy permissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decaz6v 6cl493yewt sa -m/ lk3uojy allowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowed? nuew3zphv q,: h99a6 ;jpmca 1$\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 example alsh z8ne-v+5pi(v*sof

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Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an exampz s +s1/yl7i)zog33 /npt uynule of

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an exampl )x9r1vqmbomf 4.0agn wl 6+zye of

Correct Answer:    
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Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an examplxhh/2pfk a w0+e 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 via themxx-i edsu8:5x;q;)za3 b,pyb t;ip k weak nuclear force (and presumably byzb;xe8p3 dx -;s iu; qmtiypbxka5):, 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 subgroups ca7mlb ;humjx:(lled

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 compositio t.hnrbiw, m6s 1rn:uvk55wb;n of a $\Lambda^{\circ}$?

Correct Answer:    
Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive feature of 0vh.qw + 3( cwjhf2.kx* ivktlquarks is that they

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks and antiquadq:drby) / ta3rks is

Correct Answer:    
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Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or abg69c lr d- y;wsx/wak4sorbs a gluon, the quark changes

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of j6l2xipp 5rd. 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 the focj tbst j*b0 42k(ch59q6gkjkur fundamental forces?bq4c*s(hgk6t 0bjj 5 jkckt 29

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 discoverfkf2( f+u ry v-0idma*y that two of the so-called fundamental forcev +r* (fmy-2 uf0ikdfas 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+qn(6wysl g x8 sought-after model that would unify three of the four forces of nature. Which force is the one it would not include? 68+ qywsnxgl(

Correct Answer:    
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教师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
Mark Problem
31#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What is the wavelength for a beam of iy 6/oil1it+ l1.4 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 nc v( +9* odvt jsm(u6f77bhajeeeded to accelerate proton96bvs (m 7d v(ot ejh7f+u*jcas?

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 protond+xg-q+g ,l p,sr2 jbns in a 1.7-T magnetic field. What is the frequency for the appliexl2 -bq, jrgg++d np,sd alternating voltage?

Correct Answer:    
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教师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
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 magnetic field. ky k)hra5d ;6r(mmt1gWhat is the kinetic energy of the pyrgm5kar1 d)h6k m; (trotons 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 approximately twice the3h x24qtmm u/;s0acjw proton mass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75 cm at aj ts;qum c0xa3/wh2 4m 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-anf7a -lx0q wh:rtiproton pair by annihilation of a very high energy photon. The proton and the ant:q0afx 7- lwhri-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 em 9 o dvb+bnvu2 96tdb7fql9:units two photons. What are the energies of the photonsdvvl+ d69:n f9b9 2buuoqnt7b ?

Correct Answer:    
Mark Problem
38#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The pe meson has a mass of 264 fseg+8prod( 1g44b cj times that of an electron. What is the range of the force medi+1 dc ejgo8f 44g(sbprated by this particle?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hx/ra l2avl6c6f6 5qovypothetical force with the proton as the virtual exchangevax56 rq62 fcov lal/6 particle.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the followinwncc:e* r9pt,ojsn+x. h 4er* g 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 paz **evrd*bz.g2qhgwa9vtx n3+ctm ;:rticle in the following reaction. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing partc9 *at94hjrqsicle 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 in a deuteron rr*;f wflu,8a x4pl1i gl/t4m)dz8zi($^2 H$) is

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