In a hydrogen like atom electron makes transition from an energy level with quantum number n to another with quantum number (n – 1). If n >> 1, the frequency of radiation emitted is proportional to

Question

( A ) $\frac{1}{n^3}$
( B ) $\frac{1}{n}$
( C ) $\frac{1}{n^{3/2}}$
( D ) $\frac{1}{n^2}$