State and explain de Broglie’s wave theory.

This theory states that “All moving particles like electron with high velocity have wave properties”.
This theory is applicable only for small particle like electrons, protons etc.
de Broglie’s equation is $\mathrm{\lambda }=\frac{\mathrm{h}}{\mathrm{mv}}=\frac{\mathrm{h}}{\mathrm{p}}$
Where $\mathrm{\lambda }$ = wave length
h = planck’s constant
v = velocity of the particle
mv = p = momentum of the particle
$\Rightarrow$According to debroglie, for any electron with stationary wave,
$2\mathrm{\pi r}=\mathrm{n\lambda }$
Where r = radius of the orbit
$\mathrm{\lambda }$ = wave length ; n = 1, 2, 3 ………