Question

What is photoelectric effect ? Explain it on the basis of Plank’s quantum theory?

Answer 1

The photoelectric effect appears when matter releases electrons upon vulnerability to electromagnetic radiation, such as a particle representing a quantum of light.

hν = W + E

h = Planck's constant
ν = the frequency of the incident photon
W=  work function

 an electron from the surface of a given metal: hν0
E = max. the kinetic energy of emitted electrons: 1/2 mv2

ν0 = approached frequency for the photoelectric effect

m = rest mass of the emitted electron
v =  speed of the emitted electron

E = [(pc)2 + (mc2)2](1/2)

 m = rest mass of the particle 

 c = velocity of light in a vacuum.