The energy of an electron in the nth orbit is given by `E_(n)=-13.6//n^(2) eV`. Calculate the energy required to excite an electron from ground state to the second excited state.

Explanation

Energy in ground state (n=1) is given by
`E_1=(-13.6)/(1)^2`eV=-13.6 eV
Energy in second excited state (n=3) is given by
`E_3=-13.6/(3)^2`eV=-1.51 eV
Energy required ,
`E=E_3-E_1=-1.51-(-13.6)` = 12.09 eV