Physics Unit30: Nuclear Physics and Radioactivity (id: ff4b467b7)

本题目来源于试卷: Physics Unit30: Nuclear Physics and Radioactivity，类别为 国际高中通用物理

[单选题]
When an alpha particlbc2sb:,z (n hsd;pe,l e is emitted from an unstable nucleus, the sq-2hja/. thb 9 hgj2patomic mass number of h9phh aq t-j.gs22j/bthe nucleus

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


参考答案:  D


本题详细解析: 暂无

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