The correct expression derived for the energy of an electron in the `n^(th)` enegry level is for H-atom :

Options

A. `E _(n) = (2 pi^(2) me^(4))/(n^(2) h^(2))`
B. ` E_(n) =- (2pi^(2) me ^(4))/(nh^(2))`
C. `E_(n) =-(2pi^(2) me^(2))/(n^(2) h^(2))`
D. `E_(n) = (2pi^(2) me ^(4))/(n^(2) h^(2))`

Answer

D