Modern Physics is a branch of Physics in which matter and energy are not separate, but instead are alternate forms of one another. The term modern physics refers to the study of facts and theories developed in this century that concern the interactions of matter, space and time. There have been enormous advances in Physics, and some of these advances have brought into question, or have directly contradicted, certain theories that had seemed to be strongly supported by the experimental evidence.
Modern physics mainly consists of concepts like Photoelectric Effect, Bohr’s Theory, X-Rays, de Broglie wavelength of matter waves, Moseley’s Law, Radioactivity and Nuclear physics. Among all these topics, Nuclear physics and Radioactivity are most important. The two pillars of Modern Physics are Quantum Physics and Relativity. Father of Quantum Physics is Sir Max Planck and that of Relativity is Albert Einstein.