Write a short note on quantum theory of light.

Explanation

(i) It explains photoelectric effect in which light interacts with matter as photons to eject the electrons.
(ii) A photon is a discrete packet of energy. Each photon has energy E of,
`E = hv`
(iii) Where, h is Planck's constant `(h= 6.625 xx 10^(-34) Js)` and v is frequency of electromagnetic wave.
(iv) As light has both wave as well as particle nature it is said to have dual nature. light propagates as a wave and interacts with matter as a particle.