Using de Boglie's hypothesis, explain with the help of a suitable diagram, Bohr's second postulate of quantisation of energy levels in a hydrogen atom.

De broglie assumed that electrons move in circular orbit with it mean position of vibration at periphery of assumed orbit. So assuming electron move like wave up down on a circular orbit we can say total periphery of that circular orbit will be equal to integral times of wavelength of vibration that is n×λ

Eqauting this we get n×λ = 2πr , where r is the radius of desire orbit

 So λ= 2πr/n

Again as we know λ = h/p , where p is liner momentum ()

 

From these two equation we can get the value of radius

And once value of radius is known we can find the energy of the orbit with desire radius from cuolombs law of electrostatic.

 

For diagram please refer NCERT book.