Physics Unit30: Nuclear Physics and Radioactivity (id: 51d4f462c)

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本题目来源于试卷: Physics Unit30: Nuclear Physics and Radioactivity，类别为 Generic Physics

[单选题]
When an alpha particle is emitted -b;f o2fhimv w0mhj,d-s y))n from an i1i ;,jkulo3junstable nucleus, the atomic mass number of the nucleuij1j,u;i okl3 s

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