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 国际高中通用物理

[单选题]
When an alpha particle is emitted from an unstabletbbsz9xt + fu) s/yq;:qu /dk+ixbc,( nucleus, the atomi)pv(vw );j.a 9cry(tjpr t+ jec number of tt(pajjrv9)wpcv. ()e+;yrjthe 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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