The de Broglie equation is one of the equations commonly used to define the wave properties of matter. De Broglie suggested that matter has properties similar to particles and waves and obeys the equation:
λ = hp = hmv
λ (in m) = de Broglie wavelength
h = Planck’s constant = 6.626 x 10-34 J.s
p (in kg.m.s-1) = momentum = mv (mass in kg x velocity in m.s-1)