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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 z4t)k/m2knj nso vw1k7 ut2p)if its speed doubles?w1j )s7z mt pkon)kun24v2 /kt

Correct Answer:    
Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the mg2,yef29xgs 54 iye8 zc3qjb 9ou rz:cyclotron frequency of a charged particle if the radius of its path double49cy22gmz3yu bs5,xzeof 8:jer gi q 9s?

Correct Answer:    
Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons approaching eacz 3n 5*+7h5cubo6uh qm- ojgtqh other, interacting, andh n6mo*753 u g5h-+o jtbzquqc then leaving 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 neutrino +/x;yrcl)myj c p76 qr($\nu$) 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 * k je2l,r.9jh-j(uzt*l+zz;cexky v electron 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 vivj:u0ml/w 7dirkn p( 9-hlb9kkn u5l0rtual exchange particle have on the range of the nwuvl:k05l9jum0ki kb 9nh/l7 pr (d-force it mediates?

Correct Answer:    
Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle s. aarqt:7wuja:fe67c/dd -n for the weak force is the

Correct Answer:    
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Mark Problem
8#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particles for the weak force are very massive (about 100sj)0iokvq 2gf2.oo5 m times as massive as a proton). This would lead one to expect that )o2q sojig mko .fv025the weak force would

Correct Answer:    
Mark Problem
9#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The exchange particle for quarks is cal6 *bjvvu(pr-dled

Correct Answer:    
Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that travels at the sp;k4wm0rz nt6wk9 fz w8eed 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 creatw49-h;l-axi,8kjvmfco:mr k e an odd number of electrons and positrons is th,iw8 kk;- -4rml vxh cfj9aom:at such a process would

Correct Answer:    
Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decayx9i 7lp8dod*/t5 vag+zrjq7d permissible? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    
Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay alloweh 5w7iaa0fwck2c/xv5d? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    
Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay alu)wm5ozmvci-( udee- a0 f;p.lowed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

Correct Answer:    
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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 example -- fne s2/embaof

Correct Answer:    
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Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an examp8yman0.yr qpzg37jv) ed:1 tyle of

Correct Answer:    
Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example**qvepmx p -hz0mim ,1 of

Correct Answer:    
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Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an exampj.8uv0/fz bna le of

Correct Answer:    
Mark Problem
20#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Particles that do not interact via thehn //xpx6de a+ta sy39 strong force but do interact via the weak nuclear fs 9edh6a/xnxyat /p+3orce (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 subgrcj7yr7x:l/ u u-u1wlkoups 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 composit l/e;e-kw t;sklk(zg 6okj*p)x6 g7lvion of 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 quark p,lvf* .y;r*d )jbzphs is that they

Correct Answer:    
Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks and antiqubdyi /z78 soz0arks 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, 2s c;-,lkmcllthe quark changes

Correct Answer:    
Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types o2 f(ax 81;+fmvbt*.8ypfuxwxlqih j k e4j5a,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 be one of the four fundamental f*xrufoocdki( 7150t eu a +-l.qtg.ogorces?q.g.gku- e1t(0ioda c5t+l7x*four o

Correct Answer:    
Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifying" the forc zk n3r29iurhy*zd6 6res of nature was the discovery that two of the so-called fundamental forces were two parts of a single force. 6 uyrn3rk62zh9r *zid 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 w2uf5n dfvf +0yfo3nq6ould unify three of the four forces of nature. Which force is the v2 yn ffq3f06unfo +d5one it would 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 electronsoqk)x odm-j( 0?

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 acceleras0y80u vwco7 znr 5 6.nu2w9uyfpawu 7te proton20y u c9ua560oy.fp87wvw unrz7 u nwss?

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 aam+mtmq+ a42 wy(. jw udk-1gi 1.7-T magnetic field. What is the frqm+idu tj + wgykm-wm1 (4a2.aequency 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 1.7-T u64kul /9 w2gnk3r 42a khkwkymagnetic field. What is the 22ukuk6 khnkl4rw4 yga/w39kkinetic 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 chy *;e4hue+y2 q;b wdruis p t/bpm;,5garge as a proton but approximately twice the proton mass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75 yb*s; hq5p ibe4;gwmu,ud +pyet 2/r;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 andbu+n c8+o .6ek6zzuz nihilation of a very high energy photon. The proton and the anti-proton have the same masses, but opposite charges. ndbk8 o+z 6czu.z6e+uWhat 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) decn9iox 1*a-wbv ays, it emits two photons. What are the energies of the1 wov-in*a xb9 photons?

Correct Answer:    
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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. Wha2 /ih pvsuq w233zvs8z6rpy y8t is the range of the forc3 q63z yhyppv2r8su s8/2wiv ze mediated by this particle?

Correct Answer:    
Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a op6/xi ehir2mm+68-*l. ih(founm , alc(cvbhypothetical force with the proton as the virtual exchange partifi,8.epmo mcxl (a* 2m(6+-ohri lv6hi ncu b/cle.

Correct Answer:    
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Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following reactiok5d ;gc99 ghw xdmc9 32bhbg(gn.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
41#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the folln d mfeuqi (ibjft84b(;h.r6 0owing 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 reactf: ior5v;bil (pzv 2vx-0kp*xion. $\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    
Mark Problem
43#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of quarks yb5g ,rgx)hr ztoj mb*420r r8in a deuteron ($^2 H$) is

Correct Answer:    
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