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【简答题】
由原子光谱的超精细结构发现，钠的D1线(589.6nm)又分裂成两条相距为0.0023nm的谱线，这是钠的3S1/2能级一分为二的结果．试求该能级的两个子能级的间距[参见图43.5《原子物理学》(第四版)]．
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【单选题】Social change is more likely to occur in societies where there is a mixture of different kinds of people than in societies where people are similar in many ways. The simple reason for this is that the...
A.
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