試題詳解

81. What is the energy required to excite the electron in the hydrogen atom from the n = 1 level to the n = 2 level? (R_H = 13.61 eV)
(A) 3.40 eV
(B) 6.81 eV
(C) 10.21 eV
(D) 13.61 eV
(E) None of the above.