Physics Unit30: Nuclear Physics and Radioactivity (id: 41c8fa7d0)

本题目来源于试卷: Physics Unit30: Nuclear Physics and Radioactivity，类别为 通用国际物理

[单选题]
When an alpha particle is emitted from fot 3c4 -ghi9han unstable nucleus, the at e+3w0d4r1w enmnj 4yaomic number of the4jnem 0wnyr3adew14 + nucleus

A. increases by 2.
B. decreases by 2.
C. increases by 4.
D. decreases by 4.


参考答案:  B


本题详细解析: 暂无

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