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The energy of a hydrogen atom in the first excited state is（）
The energy of a hydrogen atom in the first excited state is（）
A.-0.85 eV
B.-13.6 eV
C.-3.4 eV
D.-1.51 eV
正确答案：-3.4 eV
标签：
原子物理
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Through what angle is a 4 MeV a particle scattered when it approaches a gold nucleus with a impact parameter of 2.6 X 10-13 m？（）。
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On which of the following states of hydrogen the spin-orbit interaction has no effect？（）