試題詳解

10. In the ⁴ He atom, when the 3^rd orbital electron jumps to the 1^st orbit, what is the photon energy being emitted?
(A) 44.2 eV
(B) 48.4 eV
(C) 52.3 eV
(D) 54.1 eV
(E) 60.6 eV