Question

what is relativity and quantum mechanics

Answer 1

Answer:

The main difference is that they're theories about different things. Quantum mechanics describes the random fluctuations occurring on tiny sub-microscopic scales. General relativity describes how gravity works between large objects.

Answer 2

the branch of mechanics that deals with the mathematical description of the motion and interaction of subatomic particles, incorporating the concepts of quantization of energy, wave–particle duality, the uncertainty principle, and the correspondence principle