Modern physics
Modern physics focuses on explaining events after the year 1900 and its object of study tries to explain those phenomena that occur at speeds close to the speed of light. Ii is the twentieth century physics. Albert Einstein and Max Plank are the founders of this physics. In modern physics, unlike classical physics, matter and energy are not different entities; instead, they are different forms of each other.

Relativistic physics
Atomic physics
Nuclear physics
Quantum physics