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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 frequenip;p3g;x k;v0o;b5 eo iy7qsbcy of a charged particle if its speed doubles? vbqs;o7b05g; ie yok;ppi;3x

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Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cyclotrog6 l, fa1hmgnk))yk x-n frequency of a charged particle if the radius of its path doubles?6 f,gm)x hka)lgk-ny1

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Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two eubn:1c7kk+c6- dyt0 nuu6dz4vsfb p) lectrons approaching each other, interacting, and then leaving each other. 6bk)vdunty:u104p-fb+c67 sn dcz ku 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 indv m nj:or (oed15g9+cteraction 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?


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Mark Problem
5#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A positively charged electr;:twmd gy5 nas3qu*b; on 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 exchangzkv35jxex1k+vfq ::w e particle have on the range of the for kq5+xx:ekz3 :w1fvjvce it mediates?

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Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle forde6tm6kr0,1sdi3n gx the weak force is the

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Mark Problem
8#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particles fo)ced 9 riso:qh+;c l-hel;x -kr the weak force are very massive (about 100 times as massive as a proton). This would lead one to expect that thel : hc--l;kq9rches dei;) +ox weak force would

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Mark Problem
9#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particlb0s e o:ijxth z-d:04me for quarks is called

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Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travelolb w j4(krg2x1/ ;sjls at the speed of light

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 electrons and posixdd:dn xn8 9x7trons is that suxx 7n: 8dn9dxdch a process would

Correct Answer:    
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Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay perm5 w68r)lasav xissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay yksua8d+5 7 h9- -rcb q4b9ywjl4nuwqallowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowedfmnpx(0ts2ax5v; t0 ,yec 6c2fjf*gp? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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

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Mark Problem
16#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An electron is an exh:i; /ni duv6zrbm9n-ample of

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Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an exampxp./ )x) r*;imrzl4wsjh;mdmle of

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Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example o*pn hmn15on vc 04tbu-g5ndm(f

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Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example oy/u.i k5ad5l of

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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 intercv .y*ere.s hado y3 av1a;,a7act via the weak nuclear force (and presumably by the much weaker gr,h;.e ro7acsv.ay aea 1y3v*davitation force) are called

Correct Answer:    
Mark Problem
21#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Hadrons are divided into two subgroce) zh+fm* ;f x-xyq6eups called

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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 com9qxwu d, */7lak w8a 0hkdjq5oposition 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 th(b c*d5y.:i,dbbf py cuj lx/)at they

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Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks and antiquajo ,0as tp- gwvfch9-3rks is

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Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or absorbs a gluon, the quark chal m6*dv, otu9) ; rtb1fbomfk8v -t+hgnges

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Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of b uy6 wo)5q +3j5x-cxcane6 gmomfr6-quarks 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 fundam(cbcxfa idg626e9b iu*d/ ai2ental forces?acge2fbuid2/d6ic 6b(a9* i x

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Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step irye l m73f(z3k)log zcl4 oj;i1bc);y n "unifying" the forces of nature was the discovery that two of the so-called fund eyk3yo7;lm 3c)jcgo)lz 4i(1 lzr;fbamental forces were two parts of a single force. The two forces that were so unified were

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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-after model thatau/ .;iqsl v *xkc:(jb would unify three ofxuc*k j:;vqi bl sa/(. the four forces of nature. Which force is the one it would not include?

Correct Answer:    
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Mark Problem
31#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What is the wavelength for a beam of 1.4 GeV msc;ecs7xb8 , *l 90axqql.zvaq )gryr4 0ao)electrons?

Correct Answer:    
Mark Problem
32#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron operates at 10 M7*h ))qcabmlqb*m5mdg /tmw2 Hz. What magnetic field is needed to accelerate protonwm)ma*5 q hldm c)7 /q*bbtg2ms?

Correct Answer:    
Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m accelerates protons/um*-;0,y48gnthhhtfl2x putw 2gl h in a 1.7-T magnetic field. What is the frequencyn ;m2lu,tht8f0gh2*/hpylx4 tg-hwu for the applied alternating voltage?

Correct Answer:    
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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-d 73bpm1r4w7 lzm pz5gT magnetic field. Whatbzp77l d3g 1m4p5 mrwz is the kinetic 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 ;hcm2rpe e /eqq7)qyw l a29c/but approximately twice 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 magnetic field e2epyr9wl;/q7e/2ach)c qm q 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 annihilation c.twk mhkd .74z)zb 0t55eqe/vt2o oiof a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. What energy photon would be bwq)/d.0 eico4ot .mkk525te7h ztzv required?

Correct Answer:    
Mark Problem
37#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a positronium atom (electron + positri/n5gceb/(a ron) decays, it emits two photons. What are the energies of the photo g/ib /ce5anr(ns?

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 that of an electron. sr+d9 s *5spyr)to47o: skngmWhat is the range of the force mediated*o)n+dys mprsgs:975k 4sotr by this particle?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hyp 3r0.y/otjk/r8 ,arxqxdnh- my/ d u3zothetical force with the proton as the virtual exchange partic t j3xrmy .dr3z,0//hx8/ydkuqran-ole.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following re4 o*bs vhlym8b8m y33zaction.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
41#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing paix7l(h wqo.( amc,c3woq) 9gu rticle in 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 rs2mjqi(o- ii-ylb3 t/eaction. $\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
43#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of quarks in a deuteron (vj/i-ou9nuw8.4a 8 pu kx*ck k$^2 H$) is

Correct Answer:    
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