de-Broglie’s hypothesis

The experiments on intereference, diffraction and polarization in light infer that light behaves as waves. While the Photoelectric effect infers that the light at the time of interaction show that they behave as quanta( particle) .
The X- rays through the process of diffraction show that they are waves, while the same X-rays show that they are scattered as if they are particles following the law of conservation of energy.
The above two examples clearly talk of duality of electromagnetic radiation.