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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 of5 lzl8b +0w 2faqwmd8fxpk*j. a charged particle if its speed doubles? kmb8w8p l5q.j ffwad0+z2*lx

Correct Answer:    
Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cyclotib5 -4sohn00tsqi; m jron frequency of a charged particle if the radius of its path doubles;s onb5jh q0 ims0i4-t?

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Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two elecx ( c89slcqm9vayr:fix5 bj)8trons approaching each other, interacting, and thenlf9i5x9xcvabm8:s (ry 8c )qj 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 interaction of a ne2- kfc2p 22wwkktey3b utrino ($\nu$) 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 elvwlrek+rb 3 al d.ibip5,+39y/8rvewectron 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 particle ve5)rc o93vo ghave on the ran3r ogvevoc95) ge of the force it mediates?

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Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the wea/chroao (5 l(jl*y0p fk force 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 for wsu-eicl3 wlq : 5.mio53hxu(ce are very massive (about 100 times as massive as a proton). This would lead one to expect that thcw3x5(sqllw. u e-35u ioih:me weak force would

Correct Answer:    
Mark Problem
9#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particle for qowc / )x)oog8ouarks is called

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at thex 0*/x0-t9aa), jvvcrtz,j 3ag mqr ew speed of light

Correct Answer:    
Mark Problem
11#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  One reason a photon could not create an odd numbek8bvhu4r7f/u)bvo em/4l/ f0pedodjx ./g 6v r of electrons and positrons is t4 bdefvb u4f6d0pvmo.u/h/jo /) gk 8xe/l7 vrhat such a process would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay permissible? ka6*v.5 g9yfl1)bl ixdu7uye $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowd) y-yaii/ois/j* .l ced? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay all m*/qrq+t;amjsy5w+9le xx vuh9 c70yowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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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 examph16uejj jcj4i6*v8/h i kf)uule of

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an example ol127iv oqw hy1f

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Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example d4 d5/w/ikfr g ih,*ieof

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Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example ofbd) 0dm0 +: juhcx;2pf2qklv1us5osp

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 force but dokx6rn.i90 f tr interact via the weak nuclear force (and prenri k9 ftx6.0rsumably by the much weaker gravitation 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 iy+esh3cn i6+pl far/ 3nto two subgroups called

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 compo64 tej2juji/+osfa2 nsition 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 ll3e2np jh7q7zmin9 :that they

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarkygvi 9uw21kt+ :f f)u0hva)1 dojn8wws and antiquarks is

Correct Answer:    
Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or absorbs a gluon, thg 5-t)vrhtqx6,2ha zhe quark changes

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of quarks iz4abie: i2p*fs

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 ofbpa g.jsewz./bd -fw k7*2q/l the four fundamental forcesb7w*jg kq-.ws2pd./a b/lfz e?

Correct Answer:    
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifying" thedj jb: 2p+)(r:mmqpas h hf8v5 forces of nature was the discovery that two of the so-called fundamental forces were two parts of a si f:2ph5sv)dpjm 8b: (h aqrm+jngle 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 w wa vxb.wh:ei s)3frfu+r3*wsr5z:b+ould unify three of the four forces of nature. Whicfw.5h :ewbvr3 sru a:x*3)fs+w z br+ih force 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 for yb*b ,o3j y1ew1nvfn,a beam of 1.4 GeV electrons?

Correct Answer:    
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Mark Problem
32#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron operates at).h) w sc2f0nfnld,wj vq8(mk 10 MHz. What magnetic field is needed to accelerate protonsw j8vnm ,k)ffqnc)(.d20w hsl ?

Correct Answer:    
Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m 2 8+yg0lk w+xkdll .whaccelerates protons in a 1.7-T magnetic field. What is the freql0k +2hwkdw. lxly+8guency for the applied alternating voltage?

Correct Answer:    
Mark Problem
34#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.2t mbc*xor-em -pr 42z v+(,6okydo z.a5 m accelerates protons in a 1.7-T magnetic field. What is the kinetic energy of the protot zm.omx6 r-opzyb4o-k cvae *,2(d+rns 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 x.n . ,j2l-3 p ximkd,jssck:9migvq2approximately twice the proton mass. Suppose deuterons are being accelerated in a cyclotron in ai .x j2dgs2.m ,3kpnsqc m,9jk-i :lvxn 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 ,/her6 kqf:hjeflk7:dpyq7, create a proton-antiproton pair by annihilation of a very high energy photon. The hq: kpjfl,7,76kq:/fe eh rdyproton 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 + posizo)cehi 3+7lc tron) decays, it emits two photons. Wha+ io7z)3chl cet are the 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 264 timesyqa5mjy8 )d4 m that of an electron. What is the range of the force mediated by this particl4 )qamy 5jm8yde?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hypothetical force with2ftv 1qxq/.2f han d9e the proton as the virtual exchange particle. /td1ffve9 2a2h qx.nq

Correct Answer:    
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Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing par :;.g tl,,,eq+kxmv ym+asfwwticle 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 reaction. 5 ej, b3.7(bpdlcjsrz) wd;z z$\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the followinh gd1(xky1-n7 mcp,vm 8 qyg5wg 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 deumt81.f b;bio bd2f5z cteron ($^2 H$) is

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