氢原子的能级是氢原子处于各个定态时的能量值,它包括氢原子系统

氢原子的能级是氢原子处于各个定态时的能量值,它包括氢原子系统的电势能和电子在轨道上运动的动能,氢原子的电子由外层轨道跃迁到内层轨道时

A.氢原子的能量减小,电子的动能增加        B.氢原子的能量增加,电子的动能增加

C.氢原子的能量减小,电子的动能减小        D.氢原子的能量增加,电子的动能减小

答案

A    电子由外层轨道跃迁到内层轨道时,是由高能级向低能级跃迁,氢原子的能量减小,同时半径r减小,由得,电子的动能Ek==增加。A项正确。B、C、D三项错。

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