Ans:

We know that the ground state energy of hydrogen atom is given by –

E = − 13.6 eV

The total energy of hydrogen atom is equal to -13.6 eV. It is understood that the kinetic energy is equal to the negative of the total energy. So, we get –

Kinetic energy = − E = − (− 13.6) = 13.6 eV

Similarly, the potential energy is equal to the negative of twice the kinetic energy (T=E+V). So,

Potential energy = V= − 2 × ( 13.6 )

V = − 27.2 eV