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>>1, the frequency of radiation emitted is proportional to:

• A. \[\frac{1}{n}\]
• B. \[\frac{1}{{{n}^{2}}}\]
• C. \[\frac{1}{{}^{{{n}^{3}}}/{}_{2}}\]
• D. \[\frac{1}{{{n}^{3}}}\]