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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 particle if its speed doa ejn9efdd+1v7-kt. q e0qp2oubles?q+enq19ek v7 2tddj.-ofap e0

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 particle if thev1:fdi1cgede *+ 1m wy radius of its path doublesf y1ve+ :gmd1i*wc1de?

Correct Answer:    
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Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two elec7 i/qlda* d2sti7;qnatrons approaching each other, interacting, and then leaving each other. What particle is being exchanged during the interaiq2 ;dqa*ds7la nti/ 7ction?


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Mark Problem
4#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows the weak7ayg; 0cqjjpla y-p59ks0 xh- 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 chargedocisth 0nc23. electron is

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Mark Problem
6#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What effect does an increas/bo bj;u cn9-qmp+z8qimz e46rb1p .de in the mass of the virtual exchange particle have on the range of the force it mediatbmpb8 b4 6-d1+;npjizmq o/ eur9q.czes?

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the weak f )nxvg*g d3t6lujk2(corce is the

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 force are very massive (about 100 times as ml 0 k-iuhz9+r1pg7kciassive as a proton). This would lead one to expect that the weak force wou k0pu g-9i7crlzh1 i+kld

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Mark Problem
9#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particle for quarks is -hva p l/q8cr(s 6afh9called

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the speed a5iii zyn+rl -6kc(a5of light

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Mark Problem
11#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  One reason a photon coxs4cc,.+lsxkb qc3e 5uld not create an odd number of electrons and positrons is t x,xs e.clq53s+ckb 4chat such a process would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay permissi:fmtyvqy3:o/v+ y 0w qble? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay ao em x7eiyt,x 1a1a ou lmg, /x1bjso/pw.3j)5llowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
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Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decayq 4p7 zmmlb*z3 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 exam ) zmpel9rwcyu;+e 5lo4ow4 1mple of

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an example ol/nw ipn )0xb,;wti m/f

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example of/rim lo:nohr -45loz/

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an examplei1 wyhn)z(lr:*z4 zrej( qzg0 of

Correct Answer:    
Mark Problem
20#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Particles that do not interact via the stroerm e r,hkc v,fj+u;gu kyna1p93(36:k u3lppng force but do interact via the weak nuclear force (and presumably by the much weakm6,9gpefuk1 ;lyuke:3 p ,h3r+3 npakv j(rcuer gravitation force) are called

Correct Answer:    
Mark Problem
21#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Hadrons are divided into two ouv 5c7 to:u(gsubgroups 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 comp kx8ps+jpb;c;u.t f uwxnc3.9 osition of 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 thew(/4:wtmhad fh1rzh7)t hj 2hy

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Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some qua0y6h-9llw )k ouh *ffnrks and antiquarks 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 absorbs avpmw2 -aa1nw f9hg8b6 1:jvjz gluon, the quark changes

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of lg)jv n n/pp7:jz 2.9)cex ktlquarks is

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Mark Problem
28#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Which of the following is not considered to be one ,4g7dvjf+6 he oedbep31lu ao4r*8,xwb vnl.of the four fundamental forceswvnp*eeguvorfx4,lj3d+8617b ed ., lbah4o?

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 discovexs +,btjv**9z3cry eb ry that two of the so-called fundamental forces were two parts of a single force. xvyb9c* *,s tber3+zj 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 thath.swow u0)0 szvs iqp4wg e(mq.fb: .2 would unify three of the four forces of nature. Which f .w:4q2w s0b0.vsqzg.uhwmif po e ()sorce 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 fov ;0cfby25mr f9+piye(/kcc fr 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 ix 5)nrad2. guns needed to accelerate protons?xud )g2r. 5nna

Correct Answer:    
Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m accelerates y 5sju5 fyus7+protons in a 1.7-T magnetic field. What is the frequency for the appliefsy57 j+uuys5d 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 0.25 m accelerates protons in a 1.7-T *gzmu9cf41t vmagnetic field. What is z4 tcf9g*v um1the kinetic energy 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 approximately twice the protoszi5f)e mt.4 s ze )x0br8f14ekjgm b(n mass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75 cm at a frequency of 8.0 Mhz. What magnetix (4zm4g kebm0ef).18j5 fbtse rzis)c field is needed?

Correct Answer:    
Mark Problem
36#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Suppose you were to try tocat +gsu)z5vn i9m t0: create a proton-antiproton pair by annihilation of a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. What0ua iztsmg )t+vn: 59c energy photon would be required?

Correct Answer:    
Mark Problem
37#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a positronium atomnq u,d4 u0utv9if5 va5 (electron + positron) decays, it emits two photons. What are the energies of the dva4v u f0,9utui5nq5photons?

Correct Answer:    
Mark Problem
38#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The pe meson has a mass of 264 times thatos k0vvtuhb . zo5vg0kxir4 /.ewx8/9 of an electron. What is the range of the force mediated by this par8o.0kzxh 5wovv//.gb90 ksux i4e rtvticle?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hypothetical force withsu9p6dd r/66:hdm wa e the proton as the virtual exchange 6s d:mdrw9pa6u/ 6hdeparticle.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following r v)abl.)tq tsap1pz z1u+w:n/ eaction.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
41#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following reactiosss.q7 sn)73hvn;a,bg* k gtun. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing yd: h kurri7:jwq0s nol)- a93particle 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 ralu:-w x fe;4,xs2i- v /iez1n,j kyva deuteron ($^2 H$) is

Correct Answer:    
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