CBSE Class 12-science Answered

(b) Photon picture of electromagnetic radiation on which Einstein's photoelectric equation is based on particle nature of light. Its basic features are:

i. When interacting with matter radiation behaves like particles called photon.

ii. Each photon has energy E= h and momentum p= h/c and c= speed of light.

iii. All photons of light of a particular frequency ,wave length have same energy E=h=hc/ and momentum p= h/c what ever is the intensity of radiation be.

iv. By increasing the intensity of light of given wavelength, there is only an increase in the number of photons per second crossing a given area, with each photon having the same energy. So photon energy is independent of incident intensity.

v. Photons are electrically neutral and are not deflected by electric and magnetic fields.

vi. Photon particle collision is completely elastic in nature.