The explanation of the hydrogen atom spectrum provided by Bohr’s
model was a brilliant achievement, which greatly stimulated progress
towards the modern quantum theory 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