In a hydrogen like atom electron make transition from an energy level with quantum number `n` to another with quantum number `(n - 1)` if `n gtgt1` , the frequency of radiation emitted is proportional to :

Options

A. (a)`1/n`
B. (b)`1/(n^(2))`
C. (c)`1/(n(3)/(2))`
D. (d)`1/(n^(3))`

Answer

D

Explanation

Energy of radius emitted
`E=hv=E_(0)Z^(2)[1/((n-1)^(2))-1/n^(2)]=E_(0)Z^(2)[(2n-1)/(n^(2)(n-1)^(2))]`
`hv~~E_(0)Z^(2) [(2n)/n^(4)]implies v prop 1/n^(3)`