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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 partio*d-59/ y ptu)x 8(c f5lwp sf7yatewbcle if its speed doubl*two-sw p7u)c8fdy(9a5/ lx pe fty5bes?

Correct Answer:    
Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cyclotron frequency of a charge+7ow5pqo*jdsdd q) .dn kvg9 7d particle if the radius of its pat dd+q ko. )7pjn*oqs5d d7g9vwh doubles?

Correct Answer:    
Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons approaching each other, interacting, anjaybgfq-- sr2 x31jgt,cj *2ed then leaving each other. What particle is being exchanged during the in2sjb ,ggjrcx3j-y a- q1t*2e fteraction?


Correct Answer:    
Mark Problem
4#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows the weak interaction o8j.1x o1e ge;tvfp8khf 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 electr3w21jq eui, txon 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 particle ha2f t2h,uzrn *zbe oi2*ve on the range of the force it mediatesft z*h b22*,rnz ei2ou?

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the weak force is thk* g*d1eeyhs;f or g4:e

Correct Answer:    
Mark Problem
8#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particles for the weak force are/frm;wqx)wb8 very massive (about 100 times as massive as a br) /m8w;fqwxproton). 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 for quarks is calledhxm 0k7)o :rnkr p/5avm82 ngp

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the speeokkh8*;evbgi j .ew8w08g a7nu0e3b sd 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 n22;y wpvx0 9bm4yhcnt siqs8 7 ot8uj9umber of electrons and positrons isq299h m uyiptct4;o w2vxsjy08 sb7 8n that such a process would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay permissiblehv+umrha+p/w 8j -7)f y uiqj)? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
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Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay2iji f)2tizual1xj2)e( no+i allowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allo9co, d-v )pvg/tym3vwwed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 example omsq kf d3w6)fkq28 v +yc*qjp mn/0;ytf

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an exampl4p6 otr(cfz 0 vu 4q-cq2ef3nxe of

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example /-z)ko6k0nhs x zl jo-z .aa-sof

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example ann1p(dj) b 6ii 3np-k8hp5vr of

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 interact v5x1n(q3h*d0kn z,4luso 3qv s ti-phria the weak nuclear force (and presumably by thvxhtk,hrqod n34p ni3(q-1z 5*s sul0 e 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 6mqt8 ,m*elpb subgroups 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 composition ofel p5t/,+jg-d lvb /xv a $\Lambda^{\circ}$?

Correct Answer:    
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Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive feature of quarks is j)my 3;z;qwyj a63kny that they

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some qu*+eqmn7 c.rm .sr,+* /ei6to nthg wbzarks and antiquarks is

Correct Answer:    
Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or abg;foo 3rey4w0j: ,s efsorbs a gluon, the quark changes

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types ojj 34bbrqjvlk;c +l,9 f quarks 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 b8 cuzctn8 .v 1strtgz2o)ce)nal61mt q/p(7 be one of the four fundamental forcesc mt7))82nezl8uq.tac o g1ts(61r ptczbn/v?

Correct Answer:    
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifying" the forces of nature was the discovery thc sj34mr lp);2 qebaratq-,a;at two of the so-called fundamental forces were two parts of a single fo st;ja2;e maarcr lq3b q)4p,-rce. 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 unify three t*. fyvf7hpy* og)u,nn 0k/dk of the four forces of nature. Which force is the one it would not inclu07nkg.yuhnd ,fofkv**/t y) pde?

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 elecq*8cvc* x)8 x8g xpnqqtrons?

Correct Answer:    
Mark Problem
32#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron operates at 10 MHz. What magnetics:djannh4u 8 ( field is needed to accelerate protonu(: sja8hnd4ns?

Correct Answer:    
Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m: npo+n 4r i8q ed0u-coi0ijn8 accelerates protons in a 1.7-T magnetic field. What is the frequency for the applied rju8qoe0n: ci np oi-n4+80idalternating 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 o42 hoes 5cqakx 0-xs.a3md0.j eo )es1.7-T magnetic field. What is the kinetic energy of the protons when they ad-e h s emsjx2oeq.3s.x54ak0o)0ocleave 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 prrns f+;;j d w,qafrp.w-x 6mp+oton mass. Suppose deuterons are being accelersx ndww.+m+;r jp6r,qfa-p;f ated in 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 proton-antiproton pairzkz2tv 9, ok2lp- i r(x8yqb8s by annihilation of a very high energy photon. The proton and the anti-proton have the same masses, but opposite c zz,882 ( kov-k9xpbt2yrlisqharges. 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 + posi9y-nf/f3l ftf yfv/cz.6ojj /tron) decays, it emits two photons. Wha//f fj -jlv/n c t639ffofyzy.t 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. What is the dn8dmd;25rb g range of the force mediated by this par;rdg 8 nbm25ddticle?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range ofof2/)kuu dxzjqmr0 .; a hypothetical force with the proton as the virtual exchange particlz/ u.qu0rxkf )do;2mje.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following 1jf l52:bjcpe e:g1tg *gj9r)-*ivdy8g nzgu 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 followin9)o.-ai cvws7jo; m zvg 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 reactt,*:9aqqo: a.r,e ; pte twtpaion. $\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
43#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of quarks im 4fen35gp vj/n a deuteron ($^2 H$) is

Correct Answer:    
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