题目：
已知氦离子He+能级En与量子数n的关系和氢原子能级公式类似，处于基态的氦离子He+的电离能为E=54.4eV．为使处于基态的氦离子He+处于激发态，入射光子所需的能量可能为（氢原子能级公式En=
）（ ）E1 n2
A．13.6 eV
B．40.8 eV
C．48.0 eV
D．51.0 eV
答案：
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