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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 charg8m rld70g4,2kmzb elnh(o : hsf *nw 1,wtjxj-ed particle if its speed doubletnk8 wn:7b h4mer,dj2xzwl m0(s -fh1*oj, gls?

Correct Answer:    
Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cyclotron frequency . /mh9vuzk v+ktqx,k) of a charged particle if the radius of its path doub+),q vh zvtk.ux9k/km les?

Correct Answer:    
Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons approaching each other, interactin e6f+ vjm)6s )bi2wkyvg, and then leaving each other. What particle i6+s)ke2vmf y)6i w jvbs being exchanged during the interaction?


Correct Answer:    
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Mark Problem
4#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows the weak interactior6.o;k;(cvq uh w*gwkdib*qs:8q 1 a / )oklron 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 electron kv-wns m;wh(/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 virth ;2,bg nyurjg /d)jy9ual exchange particle have on the range of nh)jjb;/gd2rguy9, y 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 weak frwf2 5ht mw-l );4 w4cvfn;lv*g7xjuq orce 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 ver*oq)+xh gp8ouy massive (about 100 times as massive as )u8+xgq*opo h 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 isw ,bk* q b0)dx36fzhrm called

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Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that trav8e2k9abp4/ah w 6imocels 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 eqjl6 .00rpwbpp i(dp8lectrons and positrons is that such a pro l0p08(q bpjw dp6ir.pcess would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay permissibse (bze/ex6g0jr k.k7le? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay j )lgvqc wwmgmv56 t/t m6/8c.allowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allow r(uyi-3(82epcz zadus1nym2 ed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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

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Mark Problem
16#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An electron is an example5h l64p3sm*yh; ijkd g of

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an example w7:2lrht lsn: of

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example oq.h* onur16ydf

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example oswdl6x 0 r,2gc9de0ckf

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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 do interact x/ed ljyi(o.;via the weak nuclear force (and presumably by the much weaker gravitation fy led;o/ (i.jxorce) are called

Correct Answer:    
Mark Problem
21#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Hadrons are divided into two sua+b/h9jubgd). gn 1n fbgroups called

Correct Answer:    
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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 com)e9jvv j5wd dof9/yg0p4x ; fkposition of a $\Lambda^{\circ}$?

Correct Answer:    
Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive feature ofv4:x,h+ 3 v3lhanuvo r quarks is that they

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks and antiquar 1gzyw3 gmq2m-ks is

Correct Answer:    
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Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits ow, v7l50cym d0a n2a .(eknnz om7nkj9r absorbs a gluon, the quark changes

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of quarkr nw2j:yx6feb g)))ias 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 fundamv*, mvck **3obtd8xmkh -x9lul/r/j aental forcetr-l mkxlod8,j cb3*v xk/a* m*9huv/s?

Correct Answer:    
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifying" the forces of natv4(b)vil )qn7w0sjpkef 1h 1iure was the discovery that two of the so-called fundamental forces were two parbv(hkv1 ie 7)qf0lwn)i1 spj 4ts of a single 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 a3uuju v( +ck y3-d23.wkkgsye sought-after model that would unify three of the 33kjue3 k2yscd .gwvu+- ku(y four forces of nature. Which 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 a beam of mx (t.)5hvh02,vc wr8uvphx h 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 to acceleratxtf) u) jsq29jfthy 35qas p:7e protos7t )jqx3auq : y)pfs2t95jhfns?

Correct Answer:    
Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.250tgp0r, xauohl)ngkv1m4 6 g - m accelerates protons in a 1.7-T magnetic field. What is the frel ,)okahn r 0-1xp046gv mtgugquency 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 ac.t slrfb2m o4*3 9auzocelerates protons in a 1.7-T magnetic field. What is the kin4f.t*orbo2z3 s9 mlua etic 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 twi xnn is05nxik-11 4bwli;/phk ce 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 mi-kblx1wnxk1 04h;/ sp n 5niiagnetic field is needed?

Correct Answer:    
Mark Problem
36#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Suppose you were to try to creatf rz57h,8bvm fe a proton-antiproton pair by annihilation of a very high energf,z8mh7 fbv 5ry 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 (electe6:pg ca,l9 z(f wv0wlron + positron) decays, it emits two photons. What are the energies of the phot ll9v6,:eaf zpc0(wwg ons?

Correct Answer:    
Mark Problem
38#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The pe meson has a m+vpfc+ r 2:tmmass of 264 times that of an electron. What is the range of the force mediated:rft+p mv2c+m by this particle?

Correct Answer:    
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 x vop/mbwf-g+em;a sc5 : 3h0aexchangvo -w fsb maag053xepc +/;hm:e particle.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing pa*p d3dw9+u8gg(mg.ts wkwmx gnm6w8 8rticle in the following reaction.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

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 fo3dtwn tz1 mjud+3dx *:wd29lkllowing 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 rehbtq 8gjgs/ /9) u,.vjp5 bodtp* b5rxaction. $\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ?

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 deutebkp3h,un:t, tron ($^2 H$) is

Correct Answer:    
本Practice全部题目来源于https://webassign.org，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
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