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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 particle if its speed d 6zw:f v i6rq- f-b9hzk:l,a1b 81cpblz/fgnvoublrz w-/v,6b vkb- fipfa1:cgb81 l znlfqh96:zes?

Correct Answer:    
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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 radiu ,we*d 4mbfc3ds of its path dw*f4bdec,3 m 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 other, interactin0t;p ay 1i : d*:,adpzllicvdpkj8d (,g, and then leaving each other. What particle is being exchangedd,(a:yt1 vza*lpp8dd , lciij0: d; pk during the interaction?


Correct Answer:    
Mark Problem
4#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows the weak int gjnfm s 1agqg35/kb:4eraction 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?


Correct Answer:    
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Mark Problem
5#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A positively charged ehj2pax7:pk / *we2l prlectron 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 parti0qbdrum4f7 dzk ,) nl/cle have on the range of the force it mediates?rd ,7md nfk/q)l04bu z

Correct Answer:    
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Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the weako0;x, o4m yjds 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 (nl0 uichtu* mn( 7 xzbaho511massive (about 100 times as massive as a prnl51 (07*unxituzmc 1ha ho(boton). This 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 (j5x ev6*s ateto ge02ykih94 for quarks is called

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at 6h xnw( osc)l;lwin4,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 a4suaixv ,,pv6 uogy +4n odd number of electrons and positrons is that such a process would u4,oxgv+s,64vy iap u

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decsyab4 u.(6beklufw 7+ ay permissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decap jtk;9l *dy3g(kohh r0wtz*6y allowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decyz;u /u o 9wi)-/maizhay allowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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

Correct Answer:    
Mark Problem
16#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An electron is an example oigidf)*2woef mvumy ,*.2 m6 bf

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an exampls/a4:k ygmmd l5cq99ae of

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an examxf w:6vsvzc-.fv8td(ple of

Correct Answer:    
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Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example z9.flc5b 4 ljpof

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 forcea4i 3p 3txd;,hlnqk z( but do interact via the weak3x3p it h;4,dnak qlz( nuclear force (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 subgroups callede 3ix 5g,gu phkr j4r4rl,c(oqfg6 .6i

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 composition ;u40g;cw s9qguxigt-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 3/z31j z(via w. yf 4wfdv*c -/jbgvhnthat they

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks anofo4mc*tkyg xvp at;fg31he p;7a8 (+ d 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, hcg;m b8a*s)kthe quark changes

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of quarks ib.xxskm)s a( t:j is;:s

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 n6 7;v,hweml) ) xoewbrylul6f xq6 08four fundamental forces?6v 0 7,yhbqw;oll)lemx6u )r 8ew nfx6

Correct Answer:    
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifying"sg/2 g w v:3lw:pftvaz*o3pr8 the forces of nature was the discovery that two of the so-calleo wv8p pvr/ *wgtg3 s:a2zf3:ld 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 model thji04l pttu0p:t7e 4+7;szgy kknvt2 uat would unify three of the four forces 0i+4 eu 2j7ppng; t v07zu4sy:ttktlk of nature. 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 azun kmed*(k(0 yxyq4. 0 r75xyb biax7*t(vvd beam of 1.4 GeV 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 needed to accmi0 v5ekke; m3vh j.)oelerate protv0mk.)m5h; e ekjov3ions?

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.jz52*emmpqpic 4v18l c ks- y6 What is the frequency for the applied alternatj1l-yzccvmsi q 6*pm 254p ek8ing voltage?

Correct Answer:    
Mark Problem
34#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m acceler1dm - a6ww)k,n si;ueyates protons in a 1.7-T magnetic field. What is the kinetic energy o1kem uyi)6 sa ;wnw,d-f 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 the31, ti2reefxiztjklyx1f:rz.591 n c zt1/ jb proton mass. Suppose deuterons are being accelerated in 2 9tjl5rke .: 1zxf z tfit/rn1b,zecj11iy3x a cyclotron 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 create a prl (s.dy6p dw6poton-antiproton pair by annihilation of a very high energy photon. The proton and the anti-proton have the .p6(l sdyd6wp same masses, but opposite charges. What energy photon would be required?

Correct Answer:    
Mark Problem
37#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a positronium aqt8(rjoqna, ; k4lv1;d +ijgj tom (electron + positron) decays, it emits two photons. What are the ener,jjk d+ ovq;(4;ngil 8arjqt 1gies 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 elp738gzp4cm vvectron. What is the range of thgm3v8 p zpc74ve force mediated by this particle?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hypothetiz nsa9gu35inw i +1jx0cal force with the proton as the virtual exchange partic+iwz09j 3 nn g5aixsu1le.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing par t oo0/uyggp md -s7p7)y/z2uoticle 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 followlu37uybqte f/x0n.b:k g qi-l 8t +i8fing 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 reaction. p7 2yqs.zigrf m1ek9 /gacq (7$\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
43#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of quarks i5p mckuzeb;+3vj 0qm:n a deuteron ($^2 H$) is

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