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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 part4gh v5t9*isqvicle if its speed doublesvq 5tv9 shig*4?

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 charg.:iv0h0at59n gcr v xged particle if the radius of irhv0:nc 9g.0atig5x vts path doubles?

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Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons appro)b6tlmsk1jq/9y+) x lqryywxp3- x l3aching each other, interacting, and then leaving each other. Whatl /p x-3wx9yy lr3qks1)by+6lq jmxt ) particle is being exchanged during the interaction?


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Mark Problem
4#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows the (.f0 67i3t9eylhc, ysxuiqvk 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 eu1v 5m;2ww/bwh r9h -s dlb xxjoh0/a7lectron is

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Mark Problem
6#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What effect does an increase in thel j1a jxc:35(7ho woy 7hix(me mass of the virtual exchange particle have on the range of the force it medc:o 7 m5ejx(h hiy1xw3j(7a loiates?

Correct Answer:    
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Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particlei0xj yqbp/a4 + for 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 forceq27 dc, fcuu,3uaa(: xslxe;xy o32tl are very massive (about 100 times as massive as a proton). This would lead one to expect that the7:2tq uyu3c;a ,c3ol,fx (2 ldsuxaex weak force would

Correct Answer:    
Mark Problem
9#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particle for quarks i6k72-a q e2bz y pe-a sweovjbi79r)u9s called

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Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that trav zxdep7d.s.j /els at the speed 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 positif 1j:fsij; ;trons is sif:; 1f; tijjthat such a process would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay pw9k n6jg 3*wajpr, 5pm-tzdf,ermissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowed? jep-ftla)*jqg wzp 55t *b:y 1$\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowed? q2z8k7y3;uukghlm h1 w*a rh3 $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

Correct Answer:    
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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 exampler2 em/zby r45vzmr/(d jy/lk) of

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an exampler7,ytot i1+0aie zjl : of

Correct Answer:    
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Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example oflt 9sg dnw8o u5wyv;mecitx 5gx*;6 ;)

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example ofmuvw m23pur9lhv r9,a*yd81 r

Correct Answer:    
Mark Problem
20#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Particles that do not interact via the strong force butb i4 ak l.;sgc2ia:zl1( :sfmh do interact via the weak nu isk;zm21h:4flas lg i(b:.acclear 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 subgro6/gfkq - y.wusb hlnxh 89.dx1ups 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 o xgo* nncc/x,zszsg:l 4a pp0 clq sv.;2e83h;f 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 thxpy+i xz1qy9;hwoxrsr3 h;3bh8 c x20ey

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks andw2o en wohzfl22g;3 s; antiquarks is

Correct Answer:    
Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or aof-t:udo zd:y6o z*spz v67,ps o4p5wbsorbs 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 of quarks7utp2 k+ey ny30f.yoa is

Correct Answer:    
Mark Problem
28#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Which of the following is not co0qhhr910jq xgt 8q)ransidered to be one of the four fundamental forces?q1 h) jx8g0ha 0q9rtrq

Correct Answer:    
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step iv 2z2e*b accy.n "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 forces that wereec2*y2 .cvzab 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* 1njpzcc5 kdy l.(bx* three of the four forces of nature. Which force is the one it c*kjl n 1.*dzx bcy5(pwould not include?

Correct Answer:    
Mark Problem
31#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What is the wavelength for a bea )wxaec t35t+cm 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 is needed t-i/2nm b(ds vwo accelerate protonsi(sd v/b2 mw-n?

Correct Answer:    
Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m accelerates protons in a 1.7-T ma tfi5z;fu3ds )gnetic field. What is the f5u3fzf ;d)is trequency for the applied alternating voltage?

Correct Answer:    
Mark Problem
34#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m acceler(xbuf mjhn8 ,h/u ,eo,t5 jma.ates protons in a 1.7-T magnetic field. What is the kinetic energy of the protons when they leave the cyclotj b txmh8a,uf, /(o5mhje,nu.ron?

Correct Answer:    
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Mark Problem
35#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A deuteron has the same charge as a pro5j3er mue8 /o8;hlctgm.n*m m ton but approximately 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 Mhz. What magnetic field im m.mg/eu8nm* 5 3ejhrcl8to;s needed?

Correct Answer:    
Mark Problem
36#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Suppose you were to try to create a pd uoa1.3y , g7l3adcraroton-antiproton pair by annihilation of a very high energy photon. The proton and the antr7 1d3.l ay3doagcua ,i-proton have the same masses, but opposite charges. What energy photon would be required?

Correct Answer:    
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Mark Problem
37#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a positronium atopbohyv.vc. )52;7 w+ajz ltxrp b x*66glc; acm (electron + positron) decays, it emits two photons. What are ltbp;jx;wycocbpx6g.+*lr.cv25hz av a6 ) 7the energies of the photons?

Correct Answer:    
Mark Problem
38#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The pe meson has a mass of 2i2;x ayy2.nq r/ fgw4q64 times that of an electron. What is the range of the yi/xgy rq2 2;.a4fqw nforce mediated by this particle?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hypotheticamsw+ h m5)-2za2ri smwl force with the proton as the virtual exchange particl-w+msz ri2am 5sh m)w2e.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following rejwhlja/au i+t;f88/d action.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

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 following reactio1*y wvmz. ylsdb*)p7c ec ./oin. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle ng(rv+c/ yy+ain the following reaction. $\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
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Mark Problem
43#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of quarks in a deute8 fhp vjr:i36 5iin :t3aaduzc g)z;*kron ($^2 H$) is

Correct Answer:    
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