Quantum Mechanics

by ericboyer
Tags: mechanics, quantum
 Admin P: 21,883 Start with conservation of momentum. Before the photon is emitted, the net momentum of the system is 0, therefore the momentum of atom P = Mv must equal the momentum of the photon p = E/c = h$\nu$ for the net momentum to remain 0. So the atom then recoils with a velocity v = P/M = p/M. Now since the atom moves, the wavelength/frequency are affected - Doppler effect.