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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 cy*yq,ol -q p;;zyag td1clotron frequency of a charged particle if its speed doublepa1tyz, d; qq*olgy;-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 p+ft/ pbco:j+garticle if the radius of its path doubles p+bfj+c/:g ot?

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Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons approacw /1qcjc0,iu hz 90 iaw)ha8uehing each other, interacting, and then leaving each other. Wha/1cwci 0 e)u 8 iwh,q0aahzj9ut 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 inter xutz0g3n ;5ncit6 f5vg8 -9f(yhc u5f8 aigkuaction 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 chargedm 2 h.t3-zqime electron 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 l80e f5ohk +fm kvr38b g7,juwvirtual exchange particle have on the range of the for lj0kkf88+r3o7gf5v,mu wheb ce 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 th/v oh6l.-e0 qhdac( h l*ed3fpe

Correct Answer:    
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Mark Problem
8#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particles for the weaam8 n ycn,8ege73c fr5k force are very massive (about 100 times as massive as a proton). This would leade ,ca n5g7cf3ymren88 one 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 i)w ek,v8eo* ty sn1-vhs called

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the speedw pqqe6 i0u2i75qmhm0 lc5r q+ 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 anydxel +v3 w7j n;ib8r1d positrons is eib83l+j1 vnw 7r;dyx that such a process would

Correct Answer:    
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Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decaf* xy c/zmllxf(9 sm)9y permissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowed? ruo2fdorv(y i6mw5r0v2-; yn$\Sigma^+ \rightarrow p \;+\; \pi^+$

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Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following dec. 1-wb :vuwx fzt7*6 pmwuwix0ay allowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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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 exsdqd,k(n5k 4 t df.k,lample of

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an example oes.n7 1 +shvq/niavd4f

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example p0d c 7k m.f.7sy vuwot2(,pyeof

Correct Answer:    
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Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example ofbf, awu tuyf o5ai7tl5cbh.:p.*8:e j

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 0ljcf-.rx h3 lforce but do interact via the weak nuclear force (and presuma .c-llj0x hfr3bly 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 tw.p dg-k7 5lesj5i z/lio 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 composition of .1bovlss ;(wo wiwx()a $\Lambda^{\circ}$?

Correct Answer:    
Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive feature of quarks is that : c4v*3ew j,tuua d.t.gwvf*qthey

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some qu ecvn* wwj6 uiup*0p:(w zxj;yx- :;efarks and antiquarks is

Correct Answer:    
Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or abdbv q/(*sp9g 7.ge yqasorbs a gluon, the quark changes

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types o4fgoqwd7z,fu4, f r-k f quarks is

Correct Answer:    
Mark Problem
28#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Which of the following is not consideyk b-7 jcg arm .1pt4ft6py6,lfv3va .red to be one of the four fundamental force y7bga6acy p3 4-f f61jkvvrttpm.. l,s?

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 disco3;p j0g oorfe2nv146 q5qfwikvery that two of the so-called fundamental forcenfe 2 ;w5 qkpoov6jq1i34g0rfs 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 three ;im gvlkft 81zl,l.7rof the four forces of nature. Which force is the one it would not inclf,m78ig1rlz; vtl. lkude?

Correct Answer:    
Mark Problem
31#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What is the wavelength for a b 8ypl k5jsc7+jeam 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/tf svr/7 x +m+8rif *i1qkqay MHz. What magnetic field is needed to accelerate protmiy8q+ r /k/far7*v x1sf+iqtons?

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 acceleratesb 2gg2n3;wxhw protons in a 1.7-T magnetic field. What is the frequency for the applied alterna 2g;wgx2 hnbw3ting voltage?

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 magnetic fielehu 6 -nr.fmq5d. What is the kinetic energy of the protons when they leave the cyr 5ne6hqu. f-mclotron?

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 the prose9nthfn9 4v ;ton mass. Suppose deuterons are be9 senhtf 49;vning 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 crexdzx-sr:0(f 9 aue9uhate a proton-antiproton pair by annihilation of a very high energy photon. The proton and the anti-proton have t9u:eha(-0 r f x9zdsxuhe 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 (elej7scbnb bb(s -9 s(mfr43e yv;ctron + positron) decays, it emits two photons. What are the energies of the pho7c;yvs ms9 bj(eb s(b 43bnf-rtons?

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. Whancj orhi 0(8x1t is the range of the force mediated b ij(ro0c8 nxh1y this particle?

Correct Answer:    
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Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hypothetical force with the p1 jzj:tssuq9- roton as the virtual exchange jtj:zs91q- su particle.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following r98rjol24 y tgb*yjt7 qeaction.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
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Mark Problem
41#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the followingv7oi0yra* n1dc12uf y reaction. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the f/ b6a5x qng z-c+b8lopollowing 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 deut+n+sao5 sl2dxb y5w;qeron ($^2 H$) is

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