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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 cyclcsz;2c /xe* t0a wp*vlotron frequency of a charged particle if its speed doublescvz*alcw*; spt/ 2xe0?

Correct Answer:    
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Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cycl0vc+ gi-xvpi2otron frequency of a charged particle if the radius of its pa v+ i0ig-cx2pvth doubles?

Correct Answer:    
Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons approaching each other, interacting, ant x5h86s9ryy )tjb hjhqc /nr+5s9r8 t bok:1kd then leaving each other. What particle is being exchange8t9+ qojs1y6kjh k b8sb ch5rtx :trh5nry/ 9)d during the interaction?


Correct Answer:    
Mark Problem
4#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram ntlqb u*p xe7xd z9m)uu;+f3. shows 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 e57bxm4;rwq o6+lu kes lectron 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 exchywodgjtl. ) q .7a)bq7ange particle have on the range of the 7lq ydb7)jwot..g)qa force it mediates?

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle 1n,x9 h6hgl5qmtmgg,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 force are v y1rjwwf2guq48efbaf /.4 gp5ery massive (about 100 times as massqj/.45apwg r1 e2gu fy4f bw8five as a proton). 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 calrvo2 3w)1e8b(bpa mt zx.4i:ustjr7+mg im u*led

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travrxj y*- s6:.izyvy;zi 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-yv-859x janr vfw+umsoy 5 .n odd number of electrons and positrons isor+n9 mv5yuj.as5v-nw8f-xy that such a process would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay f-lg:/o .b9v*shg clt+cj r6-ci, uq dpermissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allo nf:t5ngln su h/i;1.nwed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay f1j+ er2c09 jz hvl.yh r+xs/h,emn 0fallowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

Correct Answer:    
Mark Problem
15#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The neutrino has

Correct Answer:    
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Mark Problem
16#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An electron is an example ztk( spig 5g(nbghim5vr-n05 vtm.;* of

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an example ofieuwo *f 3 tu8rj36e2 7haffz9

Correct Answer:    
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Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an exampleefi1-7- n(lmg fqn dk ;l.kdp3 of

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an examplra(v-1z(g ;vh0nnjhc e of

Correct Answer:    
Mark Problem
20#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Particles that do not interact vi;qufg1jg:fva+ zd 5m. errv2cf2b.o 7 a the strong force but do interact via the weak nuclear fo7fo1bf ug. a.2cjzr+deqmv2;g:f vr 5rce (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 subgroups caw8t gpic1 amje1xm4p1z d nd,*1fn;s; 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 comporvabm)c+ie0s*9 .mcqsition of a $\Lambda^{\circ}$?

Correct Answer:    
Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive feature orr*up hu7 9tsjo5f 5x2f quarks is that they

Correct Answer:    
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Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks and antiquark dfw2h. wh-1:ks.vc lrs is

Correct Answer:    
Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or absorbs a gluon, the quark changescxgi833xxb.q at 40os

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of qf c+m,)0-pnz *ze5shx9g igktuarks 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 four fundamental .ut:.,hb9:bf (dp9xuz mlerv forces?:em(bvf.d9h pu u,zlx b:9rt.

Correct Answer:    
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifying" the forces of natur1 q9ebzf45-7 kiewn4cwt) orm e was the discovery that two of the so-called fundamental forces were two parts of a single force. The tw 4n4c1qm)kweb 5f 7- ezri9otwo 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 model0ds1,abq0y,x azlnbv9 k99mm that would unify three of the four forces of nature. Which force is the one it would not i0, kdm1a9b9xyz,qba9v 0m snlnclude?

Correct Answer:    
Mark Problem
31#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What is the wavelength for a beam of 1.44 zxpq(k.z fn1 bz(y ;gxv9nk8 GeV electrons?

Correct Answer:    
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Mark Problem
32#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron operates a eid f/glc2o(sr*(/fq j-w2sut 10 MHz. What magnetic field is needed to accelerate protons?j 2il/fq ow -ug( ef(cd*s2/sr

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.frl5:4bx+px pg )z )hv7-T magnetic field. What 4+gpz )lrfxvbh:5p x)is the frequency 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.mx7k(r6 z1iy -5,pg m iy8yldr25 m accelerates protons in a 1.7-T magnetic field. What is the kinetic energy yd 68y1lzmgrri( -ym k75,pixof 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 theyq(*;tq gwk5yo lamd2)iq1 u. proton mass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75 cm at a frequency of 8.0 Mhogla qqt5my2 u(q.*i)ywdk ; 1z. 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-antiproton pair ;mu)x,fjbo 3 e r5v1 a-pus0krkkxi(.by annihilation of a very high enxbjuskp v5, ;.r0 ir)-f (1a3koux mekergy photon. The proton and the anti-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 + posi- hg*jqvd vn/. gj24b7w)gj rrtron) decays, it emits two photons. What are tb/ 2wnhvjj*q7 d gg-)j rgv.4rhe energies of the photons?

Correct Answer:    
Mark Problem
38#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The pe meson has a mau0 *e+sxybxil5 k+a9 7web4sbss of 264 times that of an electron. What is the range of tbu+lib s+k sxe49w07eyb xa*5 he 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 forcec x,eye 60ktuxvkk,;) with the proton as the virtual exchatx, ,0xk6ykec)u;ekvnge particle.

Correct Answer:    
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Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing partic 2:qshjvs z:a:yxn3*wkt/ 1 ksle in the following 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 particle in the following reactzo4e : fcls- f.p3*ojzp h3w9tion. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particn/h/vl -aft kv,/p3od le 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 deuteroe ;gar5 j6ybs9n ($^2 H$) is

Correct Answer:    
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