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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 chawn22m.qpsq 3pt tla-//rxp c3rged particle if its speed doublcx/latn/ sp3.qw-3q 2ppmt2r es?

Correct Answer:    

Mark Problem
2#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What happens to the cyclotron frequency of a charged 5vdd7uqaej/(gw.cd ) particle if the radius of its ecdq/ gj5wa (vd7)d. upath doubles?

Correct Answer:    

Mark Problem
3#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The Feynman diagram shows two electrons approaching each other,0ay ;3arlyc8c8 7swd r interacting, and then leaving each otheaydy;ls7 rwc880a 3 rcr. 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 o;1rj:vw1oos 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 elc,h4ow /i(df4lo qt0fectron is

Correct Answer:    

Mark Problem
6#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  What effect does an increase in the masgi+ k4vqd:u d2j)l16nvywvr ,s of the virtual exchange particle have on the range of the force it ki1w l 2:vd, vvnqgu6rd4 y)j+mediates?

Correct Answer:    

Mark Problem
7#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  An exchange particle for the weak forqkl0b h+a5/ 2 xixc.c/ymt 0cuce 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 (aboutx3s pt w+xt,fq/4wu*s 100 times as masxwps3,u t*tsxwq4 +/fsive as a proton). 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 particl 83 ju8 vuczei77.heege for 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 of tdej* z2d8 ak enz8t 6k.4aht4light

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 electrons and posit29;,xf)a cecrk w-sbhotl3u:yuu 0+l rons is that suchoxhu ;) :kfeyb,+ ca9suu-3l c0 wt2rl a process would

Correct Answer:    

Mark Problem
12#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay permissib h:n 3z2swz2 -po)bsjwle? $\Sigma^+ \rightarrow \Lambda^{\circ} \;+\; \pi^+$

Correct Answer:    

Mark Problem
13#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay avf7 6d* 75 agob0b eu;us/qdt9(f rcmillowed? $\Sigma^+ \rightarrow p \;+\; \pi^+$

Correct Answer:    

Mark Problem
14#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Is the following decay allowed?2nj(fm w6.smwjo )*5tcvz+b k $\pi^{\circ} \rightarrow \mu^+ \;+\; \nu_{\mu}$

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 ((spu;:3yhe-h v0bv s -gkwz uof

Correct Answer:    

Mark Problem
17#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A proton is an example ofr5ljucr8(:/ fhi:f j uvgj j0+

Correct Answer:    

Mark Problem
18#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A neutron is an example of. ;e6p;dr+ : m8yapejvgx*vvs

Correct Answer:    

Mark Problem
19#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A photon is an exampl-+-d ni3pi4cx -wdalmde ;xg ,e of

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 d)i7 q9easiwo6 o interact via the weak9w) ioqi 7ea6s nuclear 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 suug1kd41z*lbp u:4xeri ,)tt fbgroups 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 a7)nmiy 9t s*va $\Lambda^{\circ}$?

Correct Answer:    

Mark Problem
24#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A distinctive feature of quarksrnfzfliw/zp6ir ; +k4;9n. rz is that they

Correct Answer:    

Mark Problem
25#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The charge of some quarksx oginu(vux(y 6oy97) 1yl2se and antiquarks is

Correct Answer:    

Mark Problem
26#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  When a quark emits or absorbs a gluon, the quark chang2 al dltd.p,,i g4ema;es

Correct Answer:    

Mark Problem
27#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of types of quarv5fvz18x c4pw ks 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 fundaq z4wqt aary7,bau5 b1y:5qy x, .ij3fmental force4:q53r a ubt z i1.a,jwq5yyq7fayb,xs?

Correct Answer:    

Mark Problem
29#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A significant step in "unifying" the forces of nature waskcgrr2) ;oml4nrq: ;l the discovery that two of the so-called fundamental for g)rc4:;kmnl ;q 2olrrces 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 wourly aej04;pqz vpl,p7r;l, p8ld unify three of the four forces of nature. Whippllva 0py 4ep8jzrlr ,;;q,7ch 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 wavelength for a beam of 1.4 GeVf/p ohj1d 0ogi4w- .dc electrons?

Correct Answer:    

Mark Problem
32#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron operates at 1) 6vxx l-wnd:5dbhgyyx 6/pj50 MHz. What magnetic field is needed to accelerate prox x5p) -66ghxd/:l wbvjy 5nydtons?

Correct Answer:    

Mark Problem
33#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  A cyclotron of radius 0.25 m accele-a xrrzjo)c/sf 9 /(ktz72ldrrates protons in a 1.7-T magnetic field. What is the fres9z7tz/ca) 2(k f/rojr-d lr xquency 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 magnej/:k + ao8fuuftic field. What is the kinetic ene8ffoauk/ j+ :urgy 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 twice5tz l9lq ;y . omsg64wn3ptht2 the proton mass. Suppose deuterons are being accelerated in a cyclotron in an og w.tmtyns 3 lzoh65 4t9;q2plrbit 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 proton-antiprwaf;rjkd qsj*jf +e 081iq3. aoton pair by annihilation of a very high energy photon. The proton and the jq81sj+ki* r.;wq0aafjd 3efanti-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 + positljp /n lw3vcvknb(a :,b 004vxo*umu *ron) decays, it emits two photons. What are the energivu /j0*0xpmlkn, v4a blb v(wc3*on:ues 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 50*bqzu* o(idq fo0 gsan electron. What is the range of the force mediated by this particlzgoq 0b *f 5udi0(os*qe?

Correct Answer:    

Mark Problem
39#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Calculate the range of u4pp mtk)99afxmrn50 f3( w* t pmq3noa hypothetical force with the proton as the virtual exchange particle.9*0p3m 9f)na 4 ftmn xu(trq3 pwm5pok

Correct Answer:    

Mark Problem
40#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the following reaction0fw7w cq;yr:wvb*iv 4.
$\pi^- \;+\; p \rightarrow \pi^- \;+\; \pi^- \;+\; \pi^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    

Mark Problem
41#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  Identify the missing particle in the follo: ; iadvyd) *9ioz7vlcwing 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 reactiu5.h-d- rapbahi5 2 fi*htyk5s55 vveon. $\pi^+ \;+\; \Lambda^{\circ} \rightarrow \Sigma^+ \;+\; \;\;\;\;\;\;$ ?

Correct Answer:    

Mark Problem
43#
 
Single-Choice ( 1.0 marks) Whole-Paper View Save Problem  
  The number of quarks in a deuth wwfoph2n 9*9vrk0-5eus+sq eron ($^2 H$) is

Correct Answer:    

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