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 通用国际物理

[单选题]
When an alpha particle vj bemzu9r *7boz4nilw 834-w is emittz)ns4utsph/+7bx( cv ed from an unstable nucleus, the atomic mass number of thu4/7bz (pts+x) vcn hse 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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