19. When a hydrogen electron goes from n = 2 to n = 1, the energy of the lightemitted is equal to what fraction of its ground-state ionization energy?
(A) 3/4
(B) 1/2
(C) 1/4
(D) 1/8
(E) 1/9
答案:登入後查看
統計: 尚無統計資料
統計: 尚無統計資料