The energy of a hydrogen atom in the ground state is -13.6 eV. The energy of a He ion in the first excited state will be

Q: The energy of a hydrogen atom in the ground state is -13.6 eV. The energy of a He ion in the first excited state will be

(a) -6.8 eV

(b) -13.6 eV

(c) -27.2 eV

(d) -54.4 eV

Ans: (b)