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 particle is emittz+r e0xz0u b8;v5e honx+ --mrjris l2ed frj4vel*;i5xs19prdp /9ul hbww r2 q, nom an unstable nucleus, the atomic mass number of thep w e5 dh*pr ;1,/rsxnvq9 jw9lub24li 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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