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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 awbq ,tmmx)*i9-2:w wgjkg+agp 7z pu9 charged particle if its speed double2gjzg mp79aiwk-m+9 qwxbu:g*w,p) ts?

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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 radiuvz64*k ojq x;9y ajpj:s of itsoa v4y:xp*q;zjkj 9 6j path doubles?

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Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons approaching each othe*lsp ep:s.) acr, interacting, and then leaving each other. What particle is b: s)plcas e.p*eing exchanged during the interaction?


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Mark Problem
4#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows the weak interaction of a neutrino (c6 1oep(ci7h9 cixwf xh+9f;f$\nu$) 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 eleck9i m(*wuzl,5rl -4vdbti zk4tron 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 particehs96ky b 8omsn8) 7iyle have on the range of the fheoskyib8 ) 689s7nym orce it mediates?

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Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for thf76 nu9 vprzf-g.pa3/fcct2ds0, jbfca.2 ure weak force is the

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Mark Problem
8#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particles for the weak force are very massive (about 100 ts cjkp/ v;h8y:2 y vl4nnoc18limes as massive as a proton). This would lead on k;8nyh 4n8ls jp:v/1yvlcco2e to expect that the weak force would

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Mark Problem
9#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particle for quad1g 4 k*;lxyparks is called

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Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the spe n2ntoum*y+1eg 4g h4ced 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 electrons a.t txyzn:z+9e8yxxd+cn / 6h /qn0kg fnd positrons is thyz xt/g9qd+xn8ez/cn.t6:y+fxn0 k hat such a process would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay pernrek hrgb5t-tw,6n3g; 9k. dbmissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay alcfttsu. y (p(7 dn3;vglowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay xz0b+ 5qb0 7 akoxy3irw6wt2:v i04 ,rrwlubm allowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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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 exampltr if1noht+o7*8lq ,k (wn:nqe of

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an exampled 7.szkqr2t3 ft8sex0 of

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Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an examujqd8ni93 l 3 yn(0nxrple of

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Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example o+tz p(viue ity /l/kj4e6v5p:,9 pwq tf

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 do int6l6 xszs3mlg hojpi8 0 xe22*jeract via the weak nuclear force (and presumably by thjhl2s 8p ig2elm3*x0jox 66zse much weaker gravitation force) are called

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Mark Problem
21#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Hadrons are divided into two subgroups called dw+0k)mp1onr

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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 composition of x+f 0i0c2slqvs mz4bun: peg iw(ek 7pa.j;-1a $\Lambda^{\circ}$?

Correct Answer:    
Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive feature ofd, tkyg7.* r:4uppfuo quarks is that they

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Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks and rjr q5hqfvp,c1( z*bb;9q,px34m sefantiquarks 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 chazwtcj. 6r1 i2anges

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Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types oga 9et jsus734f quarks is

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Mark Problem
28#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Which of the following s per-, sn (pcfjs76f4 rko3*fis not considered to be one of the four fundamental forcespo jrf- k 7s ep3cf4n(sr,sf6*?

Correct Answer:    
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifying" the fo5kwuw:1u)w gdfoi 4ugdv354 )m a4j dprces of nature was the discovery that two of the so-calia13m4vwfg p)w)5uuokd d4jdw 45ug : led fundamental forces were two parts of a single force. The two forces that were so unified 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-after *ouk(kqzg(x 2model that would unify three of the four forces of nature. Which force is kx*qz(g ou2k( 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 elecq 4)ruwghj9/h(*.na4hrook mtrons?

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 tomtcukam()j pqk ; u-now:.umg9:.x 1l accelerate pro9 (xpk;q uk )cul m gm.u.:to:1njm-awtons?

Correct Answer:    
Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m acce8.7sz(nc rk++lto1 gzrg isk l5ol-0tlerates protons in a 1.7-T magnetic field. What is the freli.n r0zo81s( s+k -7 ckto g+rllztg5quency for the applied alternating voltage?

Correct Answer:    
Mark Problem
34#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radiusm.ej17us.wt n 0.25 m accelerates protons in a 1.7-T magnetic field. What is the kinetic energy of the protons when they letum sj wn.17.eave 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 twicp s7gad pk+ 8vhiod,c15556 -yy jvfsge 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 is neyiydpsvafgj 7 +k,c-8sg55p1h6 odv 5eded?

Correct Answer:    
Mark Problem
36#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Suppose you were to try (gnkuci,sb,0d5ot + 0nlj n q)/olk(i to create a proton-antiproton pair by annihilation of a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. What energy photon would bti,d)k ( +o5ncoll s0 g/,jkqbn(u0n ie 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 secwxo21uy+* two photons. What are the energies of the photonsu21*e+ x ywocs?

Correct Answer:    
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 eys +5n h-o1mvyfg9a siq(wt,xhp.a5 , lectron. What is the range of the force mediated by tx5ns+ 5q(av-.whm figa,h yp,9yo1sthis particle?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hypothetical force -tj ax rj8a6/z:9wc hswith the proton as the virtual exchange part /w-a8c96jajsz:tr xhicle.

Correct Answer:    
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Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following reaction8j2 ifqw wxfsl o0;.m4.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
41#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following 3 q/6 i db)h 4tt shn).2rubiaa5dorb:reaction. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
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Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing parv.;qmki3k1yj c(/l skticle in the following 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 de yq *+9kkpsa*lvuk 1o9vfya 63uteron ($^2 H$) is

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