Difference Between Classical Physics and Quantum Mechanics

 

Difference Between Classical Physics and Quantum Mechanics

Classical physics explains the motion and energy of large objects such as cars, balls, and planets.

Quantum mechanics explains the behavior of tiny particles like electrons and atoms where classical laws fail.

Example

·         Motion of a cricket ball → Classical physics works.

·         Motion of electrons in atoms → Quantum mechanics required.

The difference between Classical physics and Quantum physics is given below;

Feature	Classical Physics	Quantum Mechanics
Scale of study	Large objects (macroscopic world)	Very small particles (atoms, electrons, molecules)
Applicable to	Daily-life objects, planets, machines	Atoms, electrons, photons, molecules
Nature of motion	Motion is continuous and predictable	Motion is probabilistic (based on probability)
Energy values	Energy can have any value (continuous)	Energy is quantized (discrete energy levels)
Particle behavior	Particles behave only as particles	Particles behave as both waves and particles
Position and velocity	Can be measured exactly at the same time	Cannot be measured exactly simultaneously (Uncertainty Principle)
Equations used	Newton’s laws, classical mechanics	Schrödinger equation
Electron description	Electrons assumed to move in fixed paths	Electrons exist as probability clouds (orbitals)