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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 cxyry-c)o u( )ek1boy. n91vpfrequency of a charged particle if its speed doublesy.r xn-1evcc opb)91o)(yyuk?

Correct Answer:    
Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cyclotron freq6 9wf4rnm1x yruency of a charged particle if the radius of itr1f6ny 9rw 4mxs 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 other, interbw3q sdo.l tl9g05bi 8acting, and then leaving each othq 8wt ld5o.90b3blsi ger. 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 a6gwhp4emy4 eihw t9o2: 3dl4the weak 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?


Correct Answer:    
Mark Problem
5#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A positively charged el3pk o(2mqt:fuaz 719+rrixlm(ga p v.ectron is

Correct Answer:    
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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 ow2-c,8o3 g2 t l4bbb(evu ysivf the virtual exchange particle have on the range of the forcetubei- v(ygc bw,2 os3b842lv it mediates?

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle ford l(cd492 zkk9f bii;kilu w)f d2xsn-9juw6* the 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 (about 100 bbzweh39 .t6;:ws- u p+dfjgitimes as massive as a proton). This would lead one to expect that the +9h;bu jbp dig-fs:zwet . 6w3weak force would

Correct Answer:    
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Mark Problem
9#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particle for quarks is cawiii6j(my 0 - kv00dvvlled

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the sp7le)/hu)juslwl z+ +ceed 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 o;i 8ke5 ox1ldf/eib+o9 g7umydd number of electrons and positrons is tl5e;d7+1 9ig b yxemfok i8uo/hat such a process would

Correct Answer:    
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Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following deck*kuv2 yhwx7)whx )j;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 decay allowed?m/((*w xb3 2+q3mwewmyvg kmg $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowqvrzg( 44hb6ned? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

Correct Answer:    
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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 example of 6 cxgx mci/0qgq8:i/t

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an example ofbsak08bz1m:ad e*yz:o vdg(++,k tb f

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an exampl f0g*b.sk7mw rku.l,;v v+ihn8x/q qae of

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example of v l0xn)xq/rqzz0r /+q

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 . l qigig:tqx-qfgc+n8c79q 6pk1q r,interact via the weak nuclear force (and f 6ngc.q97k+r1gciq 8 qi:t-qqxp gl,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 twwzhl:9i-:7c dqwx / )w6egrm zo subgroups called

Correct Answer:    
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 of a.i5fiohdj3y ;e9*su pk ra:p0 $\Lambda^{\circ}$?

Correct Answer:    
Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive feature of quarks is tse(8 ysw1aw(chat they

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks and e6h6d-5obgt hq x,t50 +yp c azpbv6)iantiquarks is

Correct Answer:    
Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or absorbs a gq p(*5z-fw ymaluon, the quark changes

Correct Answer:    
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Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of e1beapkhz0 k*1lb+-n 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 fundame0woi,cv e+;4, 5c b ib 5g/ 0qohwrzmieun(9elntal forces (4eo zeh/ ;0+c r bw,gcwio559,ulq0iiemvnb?

Correct Answer:    
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifying"y24ko+lvw nkl 4wt.+a the forces of nature was the discovery that two of the so-called fundamental forces were two parts of a single force. v a l+knok+4w2yw4.lt 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 would unif 4148 lebm 0aiadwyc.,pug -gjy three of the four forces of nature. Which force is the one it would not iniwb4 gu . j0p4ae1maygcd 8l,-clude?

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 electronsswqi sn9, p3:y?

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 az0ppf bro169k h5mwp*ccelerate proth6kf59pmr* zp b0pow1ons?

Correct Answer:    
Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m i5e2(e 3kfwe9g6ymrwo +/xx k9.ywkdaccelerates protons in a 1.7-T magnetic field. What is the+ me ef56ygkeyw9 r.w3kd/x 2o9wkix( frequency for the applied alternating voltage?

Correct Answer:    
Mark Problem
34#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m accelerates ,fq y8yoe ki,/ypy:cz: 6 ns5yprotons in a 1.7-T magnetic field. What is the kinetic energy of the protons when they leave the cyclotys of:y:6yeincy q, 5yk,pz /8ron?

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 tw/fpol 117 p.fzb+nm6rk pz5b aice the proton mass. Suppose deuterons are being accelerated in a cyclotron in p.a zn+f l1fkzbb1p6p75 /mro an orbit of radius 75 cm at a frequency of 8.0 Mhz. What magnetic field is needed?

Correct Answer:    
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Mark Problem
36#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Suppose you were to try to a1ps53v. n 833 fmsbemdui9je create a proton-antiproton pair by annihilation of a very high energy photon. The proton and the anti-proton havedn3b3m8i pmf.sus5v j91 3aee the 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 atom (electron + positron) decays, it emits two 2j2h7fzrj-k a9pds3zphotons. Wha93r a-jfzdk27 s hpzj2t are 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 electron. Whnah0o7gg6 8+k7pxcdpj 7 k6az at is the range of the forckjkp76 gzx7onch d+ p70a68gae mediated by this particle?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a ) g,q)vep8)yt h4l2 ai.ld)x:bap scchypothetical force with the proton as the virtual exchange particldspxipyt2 4g)q))ac 8:lb ) c,leav.he.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following q xjghj wfni:4ml/k6 uic19a+.: fej 8reaction.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
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Mark Problem
41#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the follo zl2nbv1yr cnbw i97:6wing 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 particle in the folb ad0ze i;1 vfu)dnfxjttuqn/z o(b v997+ 5;nlowing 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 deuterot kqv zz )w d5y0ls84+kjhis-)n ($^2 H$) is

Correct Answer:    
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