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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 cmf5wn3v q0+z a charged particle if its speed doubl03 qfm n5wcv+zes?

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 i zatkk16dr zi8n;r39df the radius of its path doubl3dkn1zakz ;ritd69 r8es?

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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, id6infq/ ) :e xmwn)t)rljq; )ynteracting, and then leae jqiqx dyfwln)6n)/ :rt ));mving each other. 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 neutrinoo0gviy4l sk qc-e1t-: ($\nu$) 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:    
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Mark Problem
5#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A positively charged electron ifkznl,a614a mh*)6wx tq+spos

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Mark Problem
6#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What effect does an increase in a 21zd;ppe6vexz 0,l gthe mass of the virtual exchange particle have on the range ozp6x2p0d; v a1gzee ,lf the force it mediates?

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for thex m 6 *9j:hjm3nj9wou)vm6 jtsyn079fkoqyn, weak force 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 (ai;ss bx8 /da la(8c z*:v/ftghbout 100 times as massive as a proton). This would lead one to expect that the weak force wo; (lb8/fa8gvdzh isct xs/:*auld

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Mark Problem
9#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particle formheki fp1,d 2*n5qq; k9 io-yt quarks is called

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at thz+4 ;rjaxli;y:hnl ; ae 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 numume8i/ ;l,hxober of electrons and positrons is that such a pu h;m e/l8x,oirocess would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay perm,9q)64g)y pv *lfm)rupq bdsyissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowe fr71i-jzw8z+8o j t/pk6szp4p8e fpc d? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
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Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decayurntf h (n:ush/sloc* 5 b8c kki9fy66/b5-a p 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

Correct Answer:    
Mark Problem
16#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An electron is an ex ,f bxr;kn96kaample of

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an example ofc (eszd7edmg 37* vw-d

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example xtj6rv sg an* r6x92pf)( .t*,cnqipcof

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example ofto*9 t0xdsl+0,++h vei 0eo wn;req q2app4qp

Correct Answer:    
Mark Problem
20#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Particles that do not interact via the strong force but do interac p6kxcw7,3s kz2hvkwtp9y (,nt via the weak nuclear force (and presumably by the much weaker gravitation ,kwvx9tk czp7n6p, h2w(s 3ykforce) are called

Correct Answer:    
Mark Problem
21#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Hadrons are divided into two sudsmn 0i: nl-5b)vskg4 bgroups called

Correct Answer:    
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 composw/ad- kasc 3v;s 8f hxit*u 1w-zi0ja 28mpep9ition 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 thatf* q.xoxy4o3 b they

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Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks a rjwf0i 19dlug2m)9g3zq /meand antiquarks is

Correct Answer:    
Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or absorbs a gluon, th5/ z3sma* , vk/ qx mxbztna+an5x1m8te quark changes

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of edc5 c1w5jr: s;n:smuvg pm89quarks is

Correct Answer:    
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Mark Problem
28#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Which of the following is not considered to be one of lm mrw)87 8vhz5ms )yrge:pq+the four fundamental forces?rgmz+m)m )pw q5e:8 hrs78 vly

Correct Answer:    
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教师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
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifying" the forcesydvxipz;) w0 . of nature was the discovery that two of the so-called fundamental forces were tdxy;z0i.wp )vwo 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 sought-after model that wfnn3rym sv3)h + y/qc-ould unify three of the four forces of nature.ch ys)v-rq+ny f/ m33n 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 1.4 GeV er om4d4qf*lv-u)s w5blectrons?

Correct Answer:    
Mark Problem
32#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron operates at 10 MHz. What magnetic fields yaxyd qq 8nb;22v )6celkc j;jg) y8th4x6v6 is needed to accelerate protons? cq x)nxck l 8ydjyes862)y 6ahjvg2;64;tqv b

Correct Answer:    
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Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m acceleratercs7n7 ,pd(bks protons in a 1.7-T magnetic field. What is the frequency for the applied alternatdrc7k, ns7b (ping voltage?

Correct Answer:    
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-T magnetic fib(i(h i 4yxxg2sdxm-,eld. What is dm i(x,y s4(ixb2hgx -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 aseb3jk 2e4 *rkq2c1czr a proton but approximately twice the proton mass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75 cm at a frequr rzej*42ce21ckbk3q ency 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 annihilationt7 9:doh lbnk.b+bhqr-0enibuc 47i . of a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. Wh9b4n r.b no:ce7qtdluhi0 h7ikb- + b.at 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 tw z e0k0yi b0d, t;:a)dcnmzk;wo photons. What are the w0d:kimbtaye;)0 z0k ,dcn;z 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 mdun u+-:ly2m264 times that of an electron. What is the range of the force mediated by this2numlu +dym:- particle?

Correct Answer:    
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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 va5 /rk s;pq:s+u1gz,cnwhvc3 irtual exchange particle.:3 snsawzc;ph,gvc/ 1rq5u k +

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particlez c;2po3b h+1:cdxo hg in the following reaction.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
41#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particl2( s/,n+yqlgigj1 e )k6gj zsbe 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 thk1 -0pry4o8o8 ydgal- eo)asce 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 d1r4kz wmdb55 fvh(y9*6iqlfht2l)id euteron ($^2 H$) is

Correct Answer:    
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