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MHT-CET : Physics Entrance Exam

MHT - CET : Physics - Electrons and Photons Know More

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1.      Properties of Photons

a.      Applying Einstein's mass - energy equation
E =
mc2
Where E = energy,
m = mass,
c = velocity of light.
Mass of a photon is obtained as follows:

m

E

 = 

hn

 = 

h

C2

C2

C l

b.       

c.       Momentum of a photon is given by,

p = mc 

E

  .c = 

hv

 = 

h

C2

C2

C l

d.       

e.      Energy of a photon = hv; energy of a beam of n photons = nhv.

f.        Photons are electrically neutral.

2.      Path of a Charged Particle in a Magnetic Field

A charged particle moving with velocity


n

in a magnetic field


B

experiences a force

3.       


F

= q


n

x


B

a.      If a charged particle moving with velocity enters a uniform magnetic field perpendicular to its velocity, it moves in a circular path of radius

r

mn

qB

b.       

where m

= mass of the particle,

q

= charge on the particle.

c.        

d.      If a charged particle enters a uniform magnetic field so that its velocity makes an angle q with the field (i.e., its velocity has a component in the direction of the field), then it moves in hellical path around the direction of the field.

e.      If a charged particle enters a uniform magnetic field directed parallel to its velocity, then it experiences no force and continues to travel undeflected in a straight line.

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