How does quantum mechanics differ from classical mechanics?

Answer:
in quantum mechanism the energy of the photon electron vary with the frequency but independent of the intensity of the incident radiation while in classical mechanism the energy of the photon-electron should vary with intensity but should be independent of the frequency.
First answer by Anselem peter.c. Last edit by Anselem peter.c. Contributor trust: 1 [recommend contributor recommended]. Question popularity: 0 [recommend question].