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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 charged par 45mo)er u(v0h p(zeqgswi 3;zticle if its speed doubles? 4z egqpm;iro)hz50ev(wu 3( s

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 the radius rd e/(yi:: 4ic)q ,jhy0ycwpu of its path doubles?ej ycy,dw):: cru4ipyhi/ ( 0q

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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 other, interactntnl yt- l(-s)dlf +6wing, and then leaving each othe-tl-) 6y(lsn+lntdfw r. 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 neutrino ;+x s 1ps6-m3itpib yc($\nu$) 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 y14: cfrz-g,rvs -dqnis

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Mark Problem
6#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What effect does an increase in the masl)esqcy8*-jtutwdx1m1p)6:7a jttb,7r dtzs of the virtual exchange particle have on the ra yqt8ptmls u: -7w7,jtzrdttxc1*)be 1dj6)ange of the force it mediates?

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the weak fdt/ pmf/ lp8y6orce is the

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Mark Problem
8#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particles for the af2 cv tt 91ub0cu4lz2q)xz7rweak force are very massive (about 100 times as massive as a proton). Thiu9a4f )zuccbrtt z2v2x7 ql10s would lead one to expect that the weak force would

Correct Answer:    
Mark Problem
9#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particle for quarks izbzq *5:ntv:a0 j 0gsqs called

Correct Answer:    
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Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the sp /ph5i.giw v;0pgli3 reed 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 yf;cm*lr7 (*;ll idm-bri /gjcould not create an odd number of electrons and positrons is thyri;lb gmmi (jr7/l* lc-f *d;at such a process would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay permissible?bcnv+vi*c b4;ucr. mtb;b9- x $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay l ksy4il7x;k9hj n0 s n8l /h-ie2q,vwallowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowed2 p) ldgeh8(oz? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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

Correct Answer:    
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Mark Problem
16#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An electron is an exampl-8jry h al021ewb un(qe of

Correct Answer:    
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Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an exampleejd2tre3o-em57jm y( ,6 ic qv of

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example ofy oldf :iydr:v4*-, rub n9dba 6xh(4a

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example nd7p5dy8k*-w k gshk- of

Correct Answer:    
Mark Problem
20#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Particles that do not interact via the ste9f 3pq:e( whfrong force but do interact via the weak nuclear forcehf 9wf3(epe q: (and presumably by the much weaker gravitation force) are called

Correct Answer:    
Mark Problem
21#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Hadrons are divided into two subg 2 * nrhn1byurj4hp )m r,f-i)ummej96roups 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 co9vm 3xiyo +d/n ocjs)/mposition of a $\Lambda^{\circ}$?

Correct Answer:    
Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive feature of quarks iss n:0qhzbh t lux);-ft z2y6)s that they

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks and antdc4 cfug6 +cv8iquarks is

Correct Answer:    
Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or absorbs a gluon, the qua;kf:vr3r7 q5apak *pd rk changes

Correct Answer:    
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Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types onxfhbm 5 *o)::k 3 s3prfvrq:gf 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 fundamewo5(ima w9yk*.,qz qq ntal forces? (i.qqowa5 w9 qzykm,*

Correct Answer:    
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifying" the forces of nature wn y-g.ak5 wc2cas the discovery that two of the so-called fundamental forces were two parts of a single force g wcy2k5ca-.n. 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 m2+13swj 8xab awf0 rwicmy2 .5rb:kqthat would unify three of the four forces of nature. Which forc0iaykr3swx5 f :28m1jq.m 2 a+rbbcwwe 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 f7lm6q06pn;mo u. gb tbor 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 10 MHz. What magnetic field is needed to accelerate pr 8iiscy2mbz b-dh*n+ ,2,ui eyot*2,ne2 y-id ysbzc,h+ bu 8miions?

Correct Answer:    
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Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.e s:gpd g.p aq;08fv1b25 m accelerates protons in a 1.7-T magnetic field. What is the frequency for the applied alternafpp 01gb.q:dvg a ;s8eting voltage?

Correct Answer:    
Mark Problem
34#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m accelerates prdepw 27z9ke i*otons in a 1.7-T magnetic field. What is the kinetic energy of the protons when t ep2ke *w7id9zhey 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,wffvc*7nqlk k* 0zk :az)rdr q9qv2: approximately twice the proton mass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75 cm at farqqkr:)kc9 v0*dvz2z:n k,qf* wl 7a 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 create a proton-antiproton pair by annihilathfc4jrknxd- br53)8deu7 k;r min-j 6ion of a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. What energy photon would be rk rd6 ;j-rkd)3x4mb-i5fh8jc7er unn equired?

Correct Answer:    
Mark Problem
37#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a positronium atom (electromzr,l;tpalpg9 ) i*ng. x/i6, jmvyy3 n + positron) decays, it emits two photons. What are the energies of z r g9y3 p*)j tlain,iy,m6gl;pvx/m .the photons?

Correct Answer:    
Mark Problem
38#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The pe meson has a mass of3:uku rn/h/i00 kauh2 ajtq 7w 264 times that of an electron. What is the range of the fo0hauk2/ 0tu3 hqark/7 unwij:rce mediated by this particle?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hypothetical fo bpjfboq+o 0 qe,) l8pw3m30qr7strwq1 /ck*yrce with the proton as the virtual exchange partiqsb 3 l 78mcorotq0 01ek qypqb*/3+pwjrfw),cle.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the fol d(eh7z9 hpj0xtr//c (cnz qw5lowing 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 particl(zz (g( vjvr9i/v fbl0e 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 followingdgs6a 5ehf1e9 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 deuteron eo).av zcllii/veb 8a*r 469z($^2 H$) is

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