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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 cyclott9k rp 2yk f7y7ix3+brron frequency of a charged particle if its speed doubles?rk9 tixrfb 3p7y7y2k+

Correct Answer:    
Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cyclotral3eozdt8(l)/i 1t wxg4 b;xaon frequency of a charged particle if the radius of its pat8l a zbgx)iod te(;ta14l3/ xwh doubles?

Correct Answer:    
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Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons approaching ea*i (fnm2xz0ns h1a w/ ;rjftb*ch other, interacting, and thenw*(nh* x/bjn0 1tfsa;rfz 2m i leaving each other. 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 the weak interaction ol8/t:sp1ju nd f 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 electronizbpn* 76o gf 6qi 8+-vwhg+wz is

Correct Answer:    
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 havx4b k49sy, axhe on the range of the foy4a,sh4kbx 9xrce it mediates?

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle fo2xq(wsi94 ) op jxx,kdr 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 v84y 3odgah30+k xdspj 8mrm v3ery massive (about 100 times as massive as a proton). This would lead one to expect that thvyddj3k 3 80ghxm+a34op8 rsme 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 8zoht *.ruz8kr0bg+u-; h bwffor quarks is called

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the speed o,3b lvyk2 i.6;)ogur kd djfv,mmp ,6ff light

Correct Answer:    
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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 ni,ggz66 e4myh8x9is *gakz k6bno 5l,umber of electrons and positrons is that suc kozy6bi 69, 4 6g5 gg*sea,nm8xhilzkh 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 decay permiss4wj xrm* ,c1dlible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay al,f+ pi xei/en:j4yek.lowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay sqtauy h,: q-vhg45.oallowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 exampd8pp kkq+nrk81ku, .p le of

Correct Answer:    
Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an examplh qmx : 4v+k9xd2p**wmgv/fia e of

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an examplegd i2np6paq 5li()ivl p9u5: z of

Correct Answer:    
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Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an examplsbt a1h- nopuj 91.dd-4nza t1lho0z -kbe 3a8e of

Correct Answer:    
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Mark Problem
20#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Particles that do not interact via the strong force but do inf s g4u ql)+or /a0manilq(:c(teract via the weak n0on l a)+iq msl:f /g(qa4(curuclear 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 tw*p:)0y r4iyn nyaay2 so 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 compo bc25mwc tqb9 mwebpb;b7,2/ssition 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 thaznvs*szafig/ *dk;0g4/ lhor/,hko xk v0.y*t they

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks and antiac0dr2u, epe xykz+d n ex.7;8v rdqs g1/)2lnquarks 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 glbpsd7f/)x uzybc6 n o )/oj*sp/h,9pluon, the quark changes

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types , sshgll ) 8lk2:5x1krfzf m*gof 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 fundag)81 iwefqpsd 5+/vf cmental force fgwiqf51ces/d+8 vp)s?

Correct Answer:    
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Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifyingk;h/4z)4w t,c xjhg (h *a:tqgkrp y 29inte9g" the forces of nature was the discovery that two of the so-called fundamental forces were two parts of a single force. The two forces tt(pgrqjgh49w: ;2)h* zy4 t ,itxa9nhgkc/ekhat 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 suk: a;y:n73y;w sdkzofkks7y;daz3n:; ws:yu the four forces of 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 wavelengpa4q)6z pl2 tjth for 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 atpkd4 ye0a 3vy70 pj550dndadd 10 MHz. What magnetic field is needed to accelerate protons?50 5 ykja4d 0dvde03andpdy7 p

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 field 8u eak q8bw m5xitvn3:emg.39. What is the frequency formui3q.x 5wg ne v:am39 8kbet8 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 1.7-T g qvc27u2qs2zu 8pdq: magnetic field. What is the z2u g 2q2qq8su7pc:vdkinetic 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 protoif9anxx/zja7j :wo 1 ; 5+qrpnn mass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75+q w p/ix79nfxojja 1n:;azr5 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 pair by annihilation0 ioa7 l/,akyo of a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. What ener /ko0a,7yao ligy 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) decay-ctpi78s o;i9o0myqqs, it emits two photons. What are the energiyi;0 p7qmoi9s q ct-8oes 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 cvglza7c-iw p5m9u. 5nw78u wthat of an electron. What is the range of the fov9.mi- pgucw8w7n57w u ca5 lzrce mediated by this particle?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hypothe1+z re+moxh njiy5d;1ortg/ m9l an24 tical force with the proton as the virtual exchange partid21i ary +4ho/ x1tgem ;jm9n+z nl5orcle.

Correct Answer:    
Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing parti6)ttj gdz 5:fn8jm4e ycle in the following 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 following reacwnd(+ -m4)xj 4oy 5ji bgluax5tion. $\pi^+ \rightarrow \mu^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
42#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle g08d hnz3ad e6k3qzgu0 vb6e ;in the following reaction. $\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
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Mark Problem
43#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of quarks in a deuteron (n1 )p 2o+ 1j2cpblxy1q 9ieutp$^2 H$) is

Correct Answer:    
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