試題詳解

76. The energy required to remove the electron from a hydrogen atom in its ground state is 2.178 × 10^–18 J. What is the energy required to excite the electron in the He⁺ ion from the n = 1 level to the n = 2 level?
(A) 1.634 × 10^–18 J
(B) 2.178 × 10^–18 J
(C) 3.268 × 10^–18 J
(D) 8.712 × 10^–18 J
(E) None of these