De Broglie's Theory ofi the Quantum and the Doppler Principle

L. DE BROGLIE ( Phil. Mag. , Feb. 1924) has recently suggested a theory of the quantum in which the quantum is supposed to be a corpuscle of exceedingly small rest mass M which moves with a velocity c , where is less than unity by an exceedingly small amount. The momentum of such a corpuscle is M c /1 2 , and is equal to that of the light quantum hv / c . Since is so nearly unity, the momentum may be written as M c /1 2 . Different values of the frequency v are explained as being due to different values of.