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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 c kj8 s8pkof6nf/,gq2of a charged particle if its speed doubl,ckkqsg p62 8 j8fonf/es?

Correct Answer:    
Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cyclotron frequency of a charged particle if th0 lb( z,rwzlq xf bz4/v-/iba5e radius of its path doublesl xib/favq04,(z5w-/lzbb zr ?

Correct Answer:    
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Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two eqtyzsr1yd3)i5)g z w ;lectrons approaching each other, interacting, and then leaving each others) i3 1ytqzr5gy w)dz;. What particle is 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 sho+n2a( 9ppd8laep/i mpws 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 electron ish k;y eq(sxb;qg7z v 86na)u.e

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Mark Problem
6#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What effect does an inyvtw)jg84nj;k7s z0c mz7 a *ncrease in the mass of the virtual exchange particle have on the range of the force it medi v*nwz0ya z cj7g7 ntm84k)s;jates?

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the weak forcxiz(-- bn yzltpj*k403. kwy ye 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 very massive (about -w bkk i*8bpe:100 times as massive as a proton). This would lead one to expect tkpb kb-*i:8 ewhat the weak force would

Correct Answer:    
Mark Problem
9#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particle fpsrvr0*n8;vel+ys q za* b80por quarks 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 light pjz cy6*vq57n5; - cyafj7-g2zuru lt

Correct Answer:    
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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 elect5p- 4xt,zfpki 6,z cnjrons and positrons is that such a process xi6cknpjzz, pf4 5t,- would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay.i up0ou 6ruk2v.1kqr permissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay a+- /pc 3 qboy3quvz+:q3-drs+dgahj j llowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay al5sq l 79notb.gv 41eivxv7cm(lowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 examplep:wjn /z3vva ( of

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an example r :7-u,pr ql2dpbdvyy d-. ks-of

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an examplet8 ,ud/rapzs ( of

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an examplet f l.2do9oaa+iq+g,*+ mbryfa t4:l v of

Correct Answer:    
Mark Problem
20#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Particles that do not interact via the strong force but5tg. .i7usnpwl6 + jqxs0bdfd9ai75 o do interact via the weak nuclear f.g sniwo+s5pf7u5x 0 jq dabd7l9i.6t orce (and presumably 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 iso.z h-l.edn- ktw*q 2nto two subgroups 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 composi ftr;kme8,9 it(a.x s9(vkm e:juw:iotion of a $\Lambda^{\circ}$?

Correct Answer:    
Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive feature 1o(rohbdt6,a7p )p zaof 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 antiqui1xri.dc(v- a)vr qq f5qe-( sarks is

Correct Answer:    
Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or absorbssj 1qqseh mf1).+ /zxb 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 quarkc ri7zi q9)u, vet97eqz b)r4fs is

Correct Answer:    
Mark Problem
28#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Which of the following is not cemhzq cl y. rzgd 9676n*n(c.ionsidered to be one of the four fundamental forces qzrnzy(h* 9.7. ci6ncd6egml?

Correct Answer:    
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifying" the f 0jwzikcpkha n0w 4*,(orces of nature was the discovery that two of the so-called fundamental forcw*wzi4 hk0 jknc0,(paes were two parts 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 a sour fanpyjke7 zg po)138q, ,m3tght-after model that would unify three of the four forces ofan,3f13e8 y q,ppmztrjk )7g o 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 o jz/y f/,n-lb wx46-q5gfllvbeam 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. Whg t p+y(xmat,)a0u kh6at magnetic field is needed to accelerate protons?gth, +)kpyx6aa ( mt0u

Correct Answer:    
Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius wj.u,g4xgjp 2 0.25 m accelerates protons in a 1.7-T magnetic field. What is. 4g wjjgx2p,u 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 0.25 m accelerate tc65) :xmm+qbxe die:s protons in a 1.7-T magnetic field. What is the kinetic 5+qem:m xi6t )cxe:d benergy 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 twice the ptu * nvv*n1 f+f/b-o2etb.ctrroton mass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75 cm at a frequency of n tt+b2fe*vtn*c.v ur bfo-/1 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 annmh.nr.2 yag(7r qw x1x ,d-rnwihilation of a very hn. wm.xnax,1-wqdy gr27 h r(righ energy 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 + positron) decays, it emits two photoh0f82-q iplvd ;rads -ns. What are thrs dp8q h--vl0f2adi;e 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 times 68 ido dw limedd;i,*c36p.jdthat of an electron. What is the range of the force mediated by thiscd,6jde6po d i* 3ddlim;8.iw 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 scv;7.o :1 y-be mehrwexchange particcbv.1mse;y o:-h7ewr le.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following re 2,w yi z36n zp,qmmxax;31ujxaction.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
41#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle f/ shvosbh0(n w ;ojt89bxl 19in the following 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 rejk/5w-cn6t sd action. $\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
43#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of quarks in a dntv2 f vz0v4fvp ;p5u;euteron ($^2 H$) is

Correct Answer:    
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