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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 f9z6gyowp 2(pl3zngy:requency of a charged particle if its speed doubl 6gzyy (3pp9l 2onwz:ges?

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 radiuni2 y d5ia3,lgs of its 253ga, yli indpath 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 othfwkr bja1n214ixb wt09rdy( :er, interacting, and then leaving each other. What particle is being exchanged during the inter:bibk4w2rjw(f yrx1a d 1nt09 action?


Correct Answer:    
Mark Problem
4#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows the wea;0gv9m3em8:q mgmndm k 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 electron 5c7 rcji p+po2ps;x e kqi/0o8is

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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 ofg: oh o,.: oj0qv8odo0ls7mparticle have on the range of the force isj 0:l,ohm:o .d o 8oof7oq0vgt mediates?

Correct Answer:    
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Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the weak fotj9p *kgb; nd;rce is the

Correct Answer:    
Mark Problem
8#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particles forcl7guofj h x6 1z0pz*e yzy, 8men31x/ the weak force are very massive (about 100 times as massive as a zx3fy oyepngx1, z80mehl6/*7cjz 1uproton). 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 call8i-lz3i 0uls ,2bha wa vlgo9+nuwrx4 wk9a7:ed

Correct Answer:    
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Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the speetd6dy+ q8 f jhrh08b3b8o :b.t clhd3dd 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:ymf8z6h*ki s number of electrons and positrons is that such a pr *i8fhz: 6kmsyocess would

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Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decayt98 r tq+z.uly permissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

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Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following deca7bslg-:*l dv8l ggkkqe;msr 4y93)yb j : cvs6y allowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

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Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay alloc2a6o)srvd .s ,jn 7vsbtuo /mk:-,nuwed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 oh njra4 emql- 024)ifpf

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an examplelh y19a lply4n..xj0y ojs.7i of

Correct Answer:    
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Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an examp+q9zr*7l i1q u w0qahule of

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an examplrh s89;tiw c;ue of

Correct Answer:    
Mark Problem
20#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Particles that do not -jhsn rtwc,a f367xk5 interact via the strong force but do interact via the weak nuclear force (and presumably by the much weaker gravitation force) wh7s6r-,f3kn5 ja txcare called

Correct Answer:    
Mark Problem
21#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Hadrons are divided into two subgroups cal awdkn1 (bpa.d8(,oybled

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 ofg s r*d*h;r7sm a $\Lambda^{\circ}$?

Correct Answer:    
Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive feature g6 6bvvlsdwj w b.d,88of quarks is that they

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks andmc +4djir2ni xu 9i2k)w*3u cx 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, thejeh5/d pf /oa52ad cc2 quark changes

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of quarks9 -7b d mom(vmdqi/tl(t, xc k4iyi,-i 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 tk4,t 9 kazie.ke20cnw he four fundamental force9c20tki n.ak we,z4ek s?

Correct Answer:    
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifying" the forces of naturoog9gj2 t5*jht :g8 nye was the discovery that two of the so-called fundamental for8g yh5t *g9 ojno:2tgjces were 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 modesk8t9 f p-ge(kl that would unify three of the four forces of nature. Whic9(gkps -f8ket h force is the one it would not include?

Correct Answer:    
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Mark Problem
31#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What is the wavelength for a beam of (hdcj+ur k0rp pax*8+s .1:zv6 daivk1.4 GeV electrons?

Correct Answer:    
Mark Problem
32#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron operates at 10 MHz. Whatadcxohsd-,u v vf.uu 3wxd233x2g7q2 magnetic field is needed to accelerate protosv,fddhv xwuxdq-x.7 o g233322 uucans?

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 magneticjfug9m(: 8:4gcp,d 8y suabwy field. What is the frequency for the applied alternatingygjw (b sugf :dpyc4 8u8,ma9: voltage?

Correct Answer:    
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Mark Problem
34#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m accelerates protons in a 1.7-T magvjm31 o4:ju6sqr m1oqt ck+z8netic field. What q :q3souv8t14 o6 jrm+jmc1zk is the kinetic energy 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 pr-th-uwxi0) 3qr.ihm+k) b kxroton mass. Suppose deuterons are being accelerated in a cyclotron in3i -b.kkmiwhqr) 0r xx+ u)th- 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 protw+wp/b1yf ut/on-antiproton pair by annihilation of a very high energy photonw/ fuy1p/bwt +. The proton and the anti-proton have 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/rhi*o6e qd6t(xp4ejkh,y- d) decays, it emits two photons. What are the energies4hjy/d6dte- i*o6 xker( pqh, 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 (:)h 1srpyqhjzpy g s64m+m6y264 times that of an electron. What is the range of the force medi6q 4)r:yg(msyp h m+hzs6yp1jated by this particle?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hz wyiy3jbb djh1 yh3:: l6))nnypothetical force with the proton as the virtual exchange par)b1: jyjhn3y3w n ld:6y)z ibhticle.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing pdbk )o8eelu 5 18 -4eepnnhv/qarticle in the following reaction.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
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Mark Problem
41#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing partizdwj 9 o.e068rbpc)brcle in the following 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 kww)(eo s x+z+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 a744vaiqu6 .omy v-vu e deuteron ($^2 H$) is

Correct Answer:    
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