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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- /yiar wf1jaw8i ny.v+u0 q.p its speed doubles?.n .8ifi +y/pwywrua v1aj0 q-

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 the rav bu:lo6)qc i-dius of its path doub)lquc vo-i6:bles?

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,ru yvns6-o;cqsa h66cx1rr- m: jj93d8k xy6o and tca61cxr jk8 qrmyx-6-h9ysvnor 3ou :;s6dj 6hen leaving each other. What 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 interactiz g 5-rjj1y1 +rw8u 8b.afjfb h:wcnt1on 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 efx c+eb*i 9a0t/( :fsoshwg;j m1 azz9lectron 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 exchange pa7iwqip x4 ar,8q5yl sr.oy +w:rticle have on the range of the force it +aw,7ioyspx. qrwqy r:i54l8mediates?

Correct Answer:    
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Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle 380 odujiw zy(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 foqhs: vpprnjzr;;k34y2dv u2+rce are very massive (about 100 times as massive as a proton). This would lead one to expect that the w4z2qpd; u:vv 3y+n jkrr 2phs;eak force would

Correct Answer:    
Mark Problem
9#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particle for quarkox/tz8 dc- :;6yvtmbks is called

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the speed of +nilj7t j,bfq/p 7f+rlight

Correct Answer:    
Mark Problem
11#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  One reason a photon could not create)th. coop1;u t an odd number of electrons and positrons is that such a p;pooc1u h)t.t rocess would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay permissiblen4rkbt+f,qz2 ? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay alloweyyl -; ix(o/m d8m jkuv8ij)7qd? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay c.lw/08)cp-k(z z7 h5 m hstxqpqa ;vwallowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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

Correct Answer:    
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Mark Problem
16#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An electron is an expo/. bsnj):o3 lraawf3l*+vxhdv, 3c ample of

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an exampt*/k2 mcxl fdh 3o33sox 9x1 osfmu81cle of

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an examp4kbe 4-l exs:vle of

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example oi-nvri7fcgp. fs5f ):f

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 dih diu+,cdr, 3o interact via the weak nuclear force (and presumably by the much weaker gravitatidd+ucr ihi,, 3on force) are called

Correct Answer:    
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Mark Problem
21#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Hadrons are divided into two subgroups callu7tt -44djqu9odow2 g75q9hhph lj : eed

Correct Answer:    
Mark Problem
22#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A quark is

Correct Answer:    
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Mark Problem
23#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What is the quark compwtp61apnv 8 uhs1 67kqosition of a $\Lambda^{\circ}$?

Correct Answer:    
Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive featurentm w ri 5(jpo+d+1tp5:g;ben of quarks is that they

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks at+3h3*i grjhftw /iw*com6r2 fm8/u mp 3c5tmnd antiquarks is

Correct Answer:    
Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or absorbs a q/tf7t t y;xwjo./b5wgluon, the quark changes

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of quarks irq7 fxbdnusau-88r7 0r 77n dbs

Correct Answer:    
Mark Problem
28#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Which of the following is not considered to be7o; d2p gnm1u(cx ty-lho 9g5y one of the four fundamental forces7d-tl1p(ox gh9 cnoug5 y y2m;?

Correct Answer:    
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifyinjkv/ah ,j uy*p+j215rx aj2acg" 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 were so uni+2*,v aja cxj25p yja1hr k/ujfied were

Correct Answer:    
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Mark Problem
30#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The grand unified theory (GUT) is a sought-ozu2 ,/ole bqke g5w47after model that would unify three of the four forces of nature. Which force is the one it would not inc5 u7o/,gbzeewlkqo 4 2lude?

Correct Answer:    
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Mark Problem
31#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What is the wavelengtuuhe);(3e h/2n/zh-ic mn ikeh for 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 jmz( ,iqd,k/ x o(b k.l/jt.demagnetic field is needed to accelerate proton/dekkm(j. x(tljq ib,,od/ .z s?

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 okl-xxyfz81 00oe9m bys5 :ve-T magnetic field. What is the frequency for the -0 5lvo1ey 0zeb8mo sx:k9yfxapplied alternating 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 magneti8ygv+ b9dof5k/wwc g/ c field. What is the kinetic e8bcg+gy/kod95ww f v/nergy 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 0a6bp e+5hpm has a proton but approximately twice the proton mass. Suppose deuterons are being accel0 mahpe6 +bh5perated 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 create a proton-antiproton pair by annihilationim):n- l kcz*. 5wmgfu of a very high energy photon. The proton annmu.)w*l c 5mf k-zgi:d the anti-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 atom (electron + positron) decays, it emlb-9zy kw/od;rz1h ,bits two photons. What are the ;h,zl-/ kbd 9 b1ywzorenergies of the photons?

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 taqq a2esdw12p bj6v ek6aygor: *v/3+i(me2shat of an electron. What is the range of the force mediat2q2s3ke(vve/6 sbma agr6py aj *dqw+:e2 o1i ed by 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 proton as the virtual exfkvo/-hou8tg5fkq6i8(u g tl:(4us nchange iuuf6qfkolkgg/8(tvuno :45 s-8ht( particle.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following reactio8f0o t)zaz /ek7bbs w57te( vtn.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
41#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the fol,*u bruv cf u2x,fratq167 c6elowing 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 following react2repg,u42 4tn iwpeo .ion. $\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ?

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 tlv p) 9cg;)p4h x-bbpdeuteron ($^2 H$) is

Correct Answer:    
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