Evidence of Particle Nature of Light

i. Compton Effect:

When an X-ray of a known wavelength is allowed to collide with a stationary electron, the X-ray transfers energyEnergy is the ability to do work. Energy exists in several forms such as heat, kinetic or mechanical energy, light, potential energy, and electrical energy. Units of Energy: The SI unit... More and momentum to the electron. The energy lost by X-ray is equal to the energy gained by the electron, hence energy and momentum are conserved. In this way, matter behaves as a particle.

ii. Photoelectric Emission:

When a light photon hits a surface, it gives up energy to the electrons on the surface. If the energy of the incident photon is sufficient to force electrons from the electrostatic force binding the electron to the surface, electrons are removed and extra energy moves them away from the surface.

iii. Light as a Photon:

Light exists as small packets called photons or discrete packets called quanta.