In 1922, Bohr was awarded Nobel
Prize in Physics 12 6 DE BROGLIE’S EXPLANATION OF BOHR’S
SECOND POSTULATE OF QUANTISATION
Of all the postulates, Bohr made in his model of the atom,
perhaps the most puzzling is his second postulate It states
that the angular momentum of the electron orbiting around
the nucleus is quantised (that is, Ln = nh/2p; n  = 1, 2, 3 …)