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PRACTICE:Physics Unit32: Elementary Particles



 Author: physicsPublish 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 chaidjrp z- 3:+f;ybel)xrged particle if its speed doubles? x:id )yb3 fre;+z-lpj

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 radius of i: fgzy i2e0mz *c,dfz9+ft/wke 3zhz(ts path doubles?h cf+emk( zzf iz*fd09e2w /3:zt y,zg

Correct Answer:    

Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons approach b-4(x /t1np xg(yv8*pzruxufing each other, interacting, and then leaving each other. What particle is being exchanged during the interactionx8 r4 (1uvbxztu(y /fn*-pxgp?


Correct Answer:    

Mark Problem
4#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram showifvt2f +kp +;ts the weak 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?


Correct Answer:    

Mark Problem
5#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A positively charged ele(-p h;d/rhdr r6 p+wfo8.hvjtctron is

Correct Answer:    

Mark Problem
6#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What effect does an increase in the mal 1fj6v vv2j6tss of the virtual exchange particle have on the range of the force it m2j f1v j6vvl6tediates?

Correct Answer:    

Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the or5 tt/ -or8b y8zyc ct 7t5p0iu7yit3weak 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 100 timf c.+ atj p3qlu:31do9ygzc 4fes as massive as a proton). This woc+l4uyqjgdzfc3o3: a t1 9pf.uld 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 caluikt+krsf3*rt )ak6d4hu. 4m led

Correct Answer:    

Mark Problem
10#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A particle that trave r(-s 7zza0cnyls at the speed of light

Correct Answer:    

Mark Problem
11#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  One reason a photon could not create an odd number of electronsfn+3pu7u ;stbj yc,srk z c75: and positrons is that suc pjbsu r:757stu nfzy;k,3c+ch a process would

Correct Answer:    

Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay permissibluf7+pjh7x a )de? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    

Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowedx:wab-n fqo:an9rw9 l 5m17zz? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    

Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allohf+f 5 c:sy;w:vbqb1 ewed? $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 example,pcu8od tu3eu-* 5 ms v4xc+xy of

Correct Answer:    

Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an examplu k0)xgsm -//8 s+zth0mqy9 vccui b5ge of

Correct Answer:    

Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example ir. )u33io,yv wexg),avkdc. of

Correct Answer:    

Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an example of7eu3v ll )pxcv6 0ka0n

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 ut5h(6; qvgzfb3x2c7iy mdk* interact via the weak nuclear force (and presumably by the mub qx623tzk u y7 fmcdv(ig;*h5ch 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 subgroup pqleit(9kplmrp-d63-9 n ;vps called

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 of a c:; -lvljy( ,pqn4bkt $\Lambda^{\circ}$?

Correct Answer:    

Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive feature of quarks 5wzy r,x r9t-imi/n 6byw.l.vis that they

Correct Answer:    

Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarks and antiqu1-xwouv:d1 ecarks is

Correct Answer:    

Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or absorbs a gluon,b7f)p0j myw3 r the quark changes

Correct Answer:    

Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of qu d ,vugq1ni36s8 dqqeedmr136arks is

Correct Answer:    

Mark Problem
28#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Which of the following is not considered 2qevcyunvadc3j43lrxnuwqcah/ .i+ 3 z* 9., to be one of the four fundamental forces? a+qny33l uq u, .dc hczc wv*i/2jnx9ra3v4e.

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 discovery oq)rzal 9x)i 1that two of the so-called fundamental forces were two parts of a single force. The two forces tha)lq1 xra) zoi9t 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 i aq1-+eg5i079jt: fiepdyou three of t uptg0fd i9-ea:ii+ y715ejoqhe 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 waveleng5gin 5e/t;a mfth 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 at 10 MHz. What magnetic field is needed to accelerate kw13psomrxn07gj2 + cprotonos r1kp+xcw j3n2g70ms?

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. dim 6nksec/o sacn 7m6mn; +6;w,g2 shWhat is the frequency for the applied alternatdea76;; nmi wcshcm+6m ns/ ,n2sogk6 ing voltage?

Correct Answer:    

Mark Problem
34#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m acc+d s -uwq9wlc ,30hyetelerates protons in a 1.7-T magnetic field. What is the kinwwd9-0 c,hq 3tsly +euetic 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 t1g ;4trj8 g;g,nreo xuhe proton mass. Suppose deuterons are being accelerated in a cyclotron in an orbit of radius 75 cm 1re,;gtorgj; uxn 4g8at 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 p: ;;xg0yz-vb ud-fvm bair by annihilation of a very high energy photon. T;xm-gv0d;u -vz b: fbyhe 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) decays, it emits two photx y-q j ing,v/d/s(n ;0qphke50hs( vjons. What are0((5gvxyd0s/ ep- ivkh/; j,h jqqn sn the energies 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 ;et +zguw0uj9that of an electron. What is the range of +w 9e;ju 0utzgthe force mediated by this particle?

Correct Answer:    

Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of a hypothetical forbvzxu 51)p 0mrk2 yqv0ce with the proton as the virtual exchangemu0 zyr12kx5) 0qvp vb particle.

Correct Answer:    

Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in thedtl+kr q6/,k a 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 folku2sewx4s5sn,ooiam.; 6b( a lowing 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 followi.9 j 2prgk0 0lmti-xkqng 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 5h/0ibfpj v3adeuteron ($^2 H$) is

Correct Answer:    

  • :
  • Total:43 mks Pass:25.8 mks Duration:Unlimited
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