CHAPER 33 : WAVE PARTICLE DUALITY
33.1 Compton Scattering of photons
The concept of photon introduced a dual character to light; light as made up of photons i.e., particles
and of light as radiation i.e. waves. Therefore it can be said that light is a wave-particle duality.
Classical Physics and common sense make us consider waves and particles as anti-thesis of each other;
a wave cannot have particle characteristics and a particle cannot have wave characteristics.
However, Photo-electric effect is so far, the only phenomenon where the particle nature of light is
manifest explicitly. Bohr's theory - despite experimental confirmation of existence of quantized energy levels
of electrons in atoms by Frank and Hertz- provides indirect support to the particle nature of light.
What we need is indisputable evidence of the particle nature
of light. This is provided in the Compton scattering of light.