Physics Unit30: Nuclear Physics and Radioactivity (id: b573ebf82)

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 a $b-$ particle is emitted from an unstable nucleus, the atomic number of the nucleus

A. increases by 1.
B. decreases by 1.
C. does not change.
D. none of the given answers


参考答案:  A


本题详细解析: 暂无

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