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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 speexw v;gna.1weddg q 343d doubled d3n xa4wv1e .;3gqgws?

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 if the radiu:fhsj963*qp b c/cuq,r i*nses of its p /3*r9iq:cssb* c f6hnjpu, eqath 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, interm)43 l9 )9czvnr xnbd-g,ve :df-wibtacting, and then leaving each other. What particlel)w-9n4nvb3xe-did,r fb v: 9m tzc) g 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 inte8nc+0- lzkyfn ; bt vul+g/7efraction 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 ele8ti-n tr4o (foctron 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 of the virtual exchange parchalj md* 04h7j+vl*aticle have on the range of the fordj4vah+a 7lj * cm0h*lce it mediates?

Correct Answer:    
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Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle )o q -5s0 2mg7a t2sk9bokde7r-clelt for 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 1ht (.gfmw6z 3r00 times as massive as a proton). This would lead one trzm6ghtw. f3(o expect that the weak 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 (6topb/4ei w4 l (5afs oy9 ih(ppfi,ycalled

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the speed of b98c-6tzqks wh;yc)dlight

Correct Answer:    
Mark Problem
11#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  One reason a photon could not create an odd numbjc:qrvrzl6h. a 10cb : p0n:gqer of electrons and positrons is that such a p0: rjqn1przc g6b va:ch0l.q: rocess would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay permio,0 bqmr:/e hp, 6rede 7or6vissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay aloqnm loi5.he8o3i iev- :j.+v lowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowedyucdwg4w .,0p ? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 examp1b i ,e6fkza)8u3sz,eqv iqt4le of

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an example of5a mb++d/ q+ fj ml8m2uzasp;f

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an examptsz 1ukf3tx9p4xkve 1cn*)2 )k 0bt lvle of

Correct Answer:    
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Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an examplwd(-4hq 9t ()/uq6v unfsljb fe 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 inapwhid,zcg31c (xt:uy09; fr dh*;tcteract via the weak nuclear force (and presumably by the much weaker gravitati3,t;tc(*fhy; g pucxz9 adc01:r d iwhon force) are called

Correct Answer:    
Mark Problem
21#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Hadrons are divided into two subgroups calld*; kp cece,qkvv-9i: +gfj3ued

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 compositibb srziy;r mf8 4okk )r* -8j4w*91,bqyicqthon 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 the9jof o2x6egr)6.dfra 5va0mjp: f wy) y

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks and mgtj m2nk:tqf2y6r(nl 6/yq8 antiquarks is

Correct Answer:    
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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,usd;s / qe:cnd5:l-re the quark changes

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of qux* fimpxoa *nsh.n e 0m6):j-jarks 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 the four fundamental fooeupizi,fg6*;(6/+y e guj fok)/t fp rcesipf geo f/)ip6kj+ez u6/ (,ugft*o;y?

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 discot2zcxib r ezd/ o3a, -wh471s qyrc9n;very that two of the so-called fundamental forces were two parts of a single force. The two forces t/7c 3ni 4t1 sw9b2;yzeqc roa,rxh-z dhat 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 0 acv,,-,1-i yaxge1 lyf:a nu lbc5mmwould unify three of the four forces of l0f ycmna,v- :,1,a yabl1mg5-iexcu 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 h: ya w6y0rob tsm6pz5,;ta p*a beam of 1.4 GeV electrons?

Correct Answer:    
Mark Problem
32#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron operates +:ckp zml,xg +j( d*kcat 10 MHz. What magnetic field is needed to accelerate prot cz+xc( l*dp+kgkm:,jons?

Correct Answer:    
Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m accelerates prodk:befer5 xxmzw)859tons in a 1.7-T magnetic field. What is the frequency for the applied alternating voltagem zdre 59bfe8)x5w:k x?

Correct Answer:    
Mark Problem
34#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m g1 hymdo+x*d: accelerates protons in a 1.7-T magnetic field. What is the kinetic energy of the protons hog:y* xd1m+ dwhen they leave the cyclotron?

Correct Answer:    
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Mark Problem
35#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A deuteron has the same charavh1pn wr1tl,/6/ oys ge as 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 frequency of 8.0 6hap1snlt//v,ry1ow 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 annihilation o kes()o9r ejfwy :-wc;f a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. What energy photon would be requi 9 f eo()wc;-wr:jkeysred?

Correct Answer:    
Mark Problem
37#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a positronium atom (electron + positron) decays, it emgtb19r9s;bi9-i tdylits two photons. What are the energies of the phoydtig9 ;-b9l1bsi tr9tons?

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 electroeq-,m 3+k+bm2f bwvu rn. What is the range of the force m,b +b uqk2f+emv-3w rmediated by this particle?

Correct Answer:    
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 virtual e ,c hf31/ akwgoej7du2xchan 2/df7 e uw13oackj,hgge particle.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following r-ktu:qw63 1ox zbu zlrmkay4aye7y; ,y;/ r9xeaction.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
41#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following reaur;)-e .gk 9ss 8zw1dbdvxb)d 41 jafoction. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle 2l7:u,avxo 2uvwz0cain 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 deu)gg i1o0z8b7bqro4peteron ($^2 H$) is

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