Obtains Bohr's quantisation condition for angular momentum of electron orbiting in nth hydrogen atom on the basis of the wave picture of an electron using de Broglie hypothesis.

According to De-brogile's wavelength associated with an electron ; λ=h/mv..1
and the standing wave condition that circumference=whole Number of wavelength
If 'n' is the nth orbit
∴2πr=nλn2
∴since angular momentum L=mvr
from eqn (1)
L=h/λr=hr/(2πr/n)
from 1 and 2
∴L=nh/2π
Bohr's Quantization condition