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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 cycsb; f,pcf3z*qlotron frequency of a charged particle if its speed doubles?3*z;fcsb fqp,

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 o0a h/ +o )od7v1ej7yo-obnj xif the radius of itsn-vho oo0 o1a7dy/j) ej+o7 bx path doubles?

Correct Answer:    
Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electro+ime8hp /7n vgns approaching each other, interacting, and then +8np /7 vhemigleaving each other. What particle is being exchanged during the interaction?


Correct Answer:    
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Mark Problem
4#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows the weak interaction of a ne9qu dt/+ct 5jbutrino ($\nu$) 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 i7e06 fkktqry )s

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Mark Problem
6#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What effect does an increase in the g+v-qua ;fcya 9kt2p.mass of the virtual exchange particle have on the range u+;tvac.k- 2q y 9agpfof the force it mediates?

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the wl. a/mkqae 8gt;oj4x+eak 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 arec6 ;;r(s 1.uzftapg vdz 3ci2k very massive (about 100 times as massive as a proto6dzt 31z;;cas( i2rk.pugvcf n). This would lead one to 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 )1bjgxb 20qhb)v7hznc8 o4x ecalled

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the cujx;u 6i7 yk,speed 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 ca3e) yocad32i reate an odd number of electrons and positrons is eica )y3dao23that such a process would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay perpm( -nlm sy/k,uad-85x 7ybn9ypo/ ngmissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decayqxm6)h:x6 -0crzvhi y allowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowe(bhkz 3dkv6gc y8+n4od? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 examplu n0v6g2ef a9 nv;;ylte of

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Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an example bvv,.mvjw3z77 k8+e/f auy qtza 2.l vof

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example tw4 vo ,nx vnlwz+r1hca tg7,;7c -.guof

Correct Answer:    
Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example ofy4owi7juop7i+8n xg/

Correct Answer:    
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Mark Problem
20#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Particles that do not interact viak n 6wbv/4pp//uv lc-e the strong force but do interact via the weak nucle-/6 v/4cwpebvnpku l/ar 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 calf ep/rs+i*3fm led

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 comp nxexd. ,ayaf.z )o nzh1n1zg nb.1bmb35n w7)osition of a $\Lambda^{\circ}$?

Correct Answer:    
Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive feature of quarks qv7i (zf2i*no is that they

Correct Answer:    
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Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks and antiquar n90xuhqz 4ytucc.u m*14 cd2os;jy*mks 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 i ocnm,bc+fl0,gak2 j /)-ersabsorbs a gluon, the quark changes

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of quarks is)opc y dm4bjp dd)a164

Correct Answer:    
Mark Problem
28#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Which of the following is not considered to be zdv*u4 xp9d-xtki)rk s .7m5m one of the four fundamental forces x u5 kp s4vm9dxi.m*d)zk-r7t?

Correct Answer:    
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Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifying" thrz1it09bu q:)fl qvc9e forces of nature was the discovery that two of the so-c9ctf:lzq0 qur)ib9v 1 alled fundamental forces 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 model that-ikfym 5-*-4p ihn0oaqs zr;k would unify three of the four forces of nature. Which force is the one it wou ;i -m*s5y-fqi4arzk nk0-ophld not include?

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 ele8z /4hua k)r h-pvs-qx-f7ap xctrons?

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 accelerate jqpxv j0zd t*,lwaezl;8a, 27 protonsz8ja jlqw,l0 ;7et va,zp 2*dx?

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 fin2,lpltpn6xpjq-o 4 jka736 leld. What is the frequencyajpn6,xkq l -4p7t 3lnpjo l26 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 protons in a 1.75. y evkwmot:7nmc 8z+-T magnetic field. What is the kinetic energy of the protons when they leave the cyccwo+.n : 7t8zm ve5kmylotron?

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 proton mb9 1t*wgoqi6+cl0y )fgw z7l yass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75 cm at a frequen9wwbg t1llc6o0y +qyfzi )g7*cy 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 pair by annij2m,mn.rr zm9 f9 z brpkqb)1;hilation of a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. Wrnr91pmzqz;)9b ,brkm 2mf j. hat 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 emit 12(acp(oeiyc ;)vypgs two photons. What are the 2cvyo(a p; gy)i1e (cpenergies 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 s)ok3xxkc* f0a( pa;:ys3nzb 9 tyh7xrange of the force mediate3)ay b(khts3; oaspxcn xx* 97:fyk0zd by this particle?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range ug:ree58uaxcq *wa3 )a.:w ufukpm - ,of a hypothetical force with the proton as the virtual exchange paru.u,mwe-uxgr :53q :ea8 ku fp)*cwaaticle.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following reactrc( 3b9 jojguhl.0s4.sd jkh6ion.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
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Mark Problem
41#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing pargdn.l9n*n(jx +- jrjyv , (ykaticle 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 partn kxgd+-1( :tzev pu0e8 -d- e)ujnogbicle in 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 deuterontr..y7v9 8 x4q 1eqlzuo 5dyi n(zcii8 ($^2 H$) is

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