Total energy in the ground state isE = PE(U) + KE(K) = 0 + 13.6 eV = 13.6 eV Energy required to shift to first excited state is E2−E1=ΔE=−13.622 − −13.6eV=10.2  eV∴Total energy in the first excited state  = (13.6 + 10.2) eV = 23.8 eV