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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 )zz 0ac.)hj(tkwz xe3charged particle if its speed doubla3t z e.cjh)zwx0 kz()es?

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Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cyclotron frequency o qugz538-yfb7hz 6k wrf a charged particle if the radius of its path doyq758z -h6gf3 zru bkwubles?

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Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons asel k-fs7d3r16nas3 9l ga idi9mk-4npproaching each other, interacting, and then leaving each othe96 a34armd -nin7kdli-gske39 sf1slr. What particle is being 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 weperi4mp 6c kj8b-o 8)qak 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?


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Mark Problem
5#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A positively charged el9otzcp ka6oz+g vz04)ectron is

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Mark Problem
6#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What effect does an by) 1e+uoj-cx increase in the mass of the virtual exchange particle have on j)xycu -b1eo+ the range of the force it mediates?

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Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the weak v/m0pcpx,u(ah zzdd/u u. +f* force is the

Correct Answer:    
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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 (as r) +-wa d8o3-yt hzk+sdfyz/9h e1abbout 100 times as massive as a proton). This woulof h31+dzs-k 9 wre) tb/+adshayz8y- d lead one 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 quarksp a;gcmw:ix-s;o ( si( is called

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Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at thxv49wjjj2drm qm-j i3aiik/,q.ye7 : e 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 posit2u ao-:r i k0h/m rx2; 9s5of+houvjbfrons is :/bx okof 5; juv9h0ohs2ir- m2 aufr+that such a process would

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Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay pe64dh km ebh5g e4g(t7nrmissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay alloo0xyf.r hq:6,upil2x.w p /jrwed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay all z*n*l 6c8bji1i ct4flowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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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 example of e9 iz/yxp18a9+s6z0 skbkr5,uiezt s

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Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an examph:vs l/kj7awae-fc 7qfz 0jd/v(:c 9id1 (t asle of

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Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an exampw8)etk p 35o:n8vjvqrw4:p fi le of

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Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example of8f:e :nu my0c hp1ke jy-q:3cv

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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 in u0hz5jur7s x zig,:vcbh-3b.teract via the weak nuclear foj ih3gs5bz r.7 0:b-xu h,uzcvrce (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 into two subgroups ca*rb +j rgu*d5llled

Correct Answer:    
本Practice全部题目来源于https://webassign.org，学生可自助刷题练习，扫右侧二维码加微信，获取学习资料，答疑辅导
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
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 cohg qjstk+6t g5n1xv .:zkc/u6 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 is that the5br,/tugwoe55 cch fz 1,n3xjy

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Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks9k0+s tr: otgs and antiquarks 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 quar-:q 92hlpgq xlk changes

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Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types oflm(l k))k le yw9rp/tm riq20* quarks is

Correct Answer:    
Mark Problem
28#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Which of the following is not consd48dphg)g n;e(is ( ddidered to be one of the four fundamental forces?i( np;)sded4g(8hdg d

Correct Answer:    
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Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifying" the forces of nat+ 0 6aaez.pvbp+ quqzub8i2n 7ure was the discovery that two of the so-called fundamental forces wp0q 6eq z287pnba+u. +zu ibvaere 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 sought-after mod)uzkd)3 tzxdrk0c nifk4 h 966el that would unify three of the four forces of nature. Which force is tciduzt4k9)h 6dx6)z rknk 0f3he 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 GeVx6i z+f:zx2 yr electrons?

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 nee.5+ bqoi9nk psded to accelerate protonsbkp.iq5+s9n o ?

Correct Answer:    
Mark Problem
33#
 
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 field. 056elsh nje+p What is the frequency for the applied alt6helje5 ns0p+ernating voltage?

Correct Answer:    
Mark Problem
34#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius c/;0msxsz v u:0.25 m accelerates protons in a 1.7-T magnetic field. What is the kinetic envu; zs/x0csm: ergy 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 protouz 6,(lm/+d7 b+hxeku dlarx*n mass. Suppose deuterons are being accelerated in a cd 7, lz*rxd+/ ak x(hm6ulub+eyclotron in an orbit of radius 75 cm at a 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 creajdu s17ojrp.2te a proton-antiproton pair by annihilation of a very high energy photon. The proton and t17 p jdur2os.jhe anti-proton have the same masses, but opposite charges. What energy photon would be required?

Correct Answer:    
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Mark Problem
37#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a positronium atom (electron + positron) decays, it emits two d8i:wizc,wa1vyt:8 dphotons. What a:a8vc i8t y,dwd:1i wzre the 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 that of an el; w8apeo u gvzbo,9*s(ectron. What is the range of the force mediated by this particvp9,wu*(o e; os8gz bale?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hypothetical force wit+jwhs)l1:7bx ufsfo76 q7ulxm-*x p zh the proton as the virtual exchange poq1zs x7x *slpux f)w7mj lf7h:6+ub -article.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particy34bti/u0k2i x9q mvhle 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 particle in the following re7j1j1 osj wejfp5.o+taqsa 49action. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing parsrt tz tst*r,k3 5pt.djp1r 46ticle 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 deuteron 6/ rplmxxjc-/ z+:getab /bhf+ p9a2y ($^2 H$) is

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