The energy of an electron in \[{{n}^{th}}\] orbit of hydrogen atom is [MP PET 1999]

• A.        \[\frac{13.6}{{{n}^{4}}}eV\]        
• B.        \[\frac{13.6}{{{n}^{3}}}eV\]
• C.        \[\frac{13.6}{{{n}^{2}}}eV\]        
• D.        \[\frac{13.6}{n}eV\]