According to De Broglie equation / hypothesis is a fundamental relationship that relates wavelength of particle to its momentum .Debroglie is basically used to define wave properties of matter. Thus the matter particle like electron show dual character i.e. it behaves like a particle as well as wave. It is represented by the relation 

lambda = h/mv = h /p , where h is the planck's constant ( 6.62607 * 10^-34  Js ) , m = mass , v = velocity of particle  and p = momentum and lambda is the symbol used to denote wavelength.