Dual nature of electro magnetic radiations was not given I think it was important so this askIITians was so waste

The photoelectric effect could be explained considering that radiations consist of small packets of energy called quanta. These packets of energy can be treated as particles. On the other hand, radiations exhibit a phenomenon of interference and diffraction which indicated that they possess wave nature. So it may be concluded that electromagnetic radiations possess dual nature.

1. Particle nature
2. wave nature