• Dr.HEMALATHA MANOHARAN
• Dr.K.PERUMAL
• Dr.V.PONNUSWAMY

Classical Physics focuses on macroscopic world. This was established before 20th century. All theories and Laws discovered before 20th century is termed as classical physics. Key areas of classical physics are electromagnetism, Thermodynamics and Mechanics. There are certain limitations in classical physics when working with microscopic objects like atom and subatomic particles. In these situations Quantum Mechanics and General theory of Relativity becomes necessary. There are many types in classical physics. Namely classical mechanics, Optics, Electromagnetism and Acoustics. On the other hand Modern physics is a branch of physics which works on Quantum Mechanics and theory of relativity. The discoveries made after 20th century in the Newtonian concepts is called Modern physics. Some of the lessons in it are Nuclear physics, Quantum Mechanics, Photoelectric effect, Bohr’s atomic model, dual nature of matter and radiation. Galileo Galilei is known as the father of physics. He introduced in physics the experimental methods, the formulas for laws of motion and Inertia was given by him. Sir Issac Newton is known as the father of classical physics. The Gravitational Law and three laws of motion was discovered by him. He has contributed in the field of optics. Albert Einstein is known as the father of modern physics. He was famous for his ground breaking theories of General, special theory of relativity and photo electric effect.

Classical physics – Modern Physics – Photoelectric effect Relativity – Quantum Mechanics – Optics – Acoustics – Classical Mechanics

"CLASSICAL PHYSICS AND MODERN PHYSICS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.12, Issue 3, page no.h783-h786, March-2025, Available :http://www.jetir.org/papers/JETIR2503795.pdf

"CLASSICAL PHYSICS AND MODERN PHYSICS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.12, Issue 3, page no. pph783-h786, March-2025, Available at : http://www.jetir.org/papers/JETIR2503795.pdf