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 from anj2e3 x ,bia aj,z.b54q(dw dug unstableu g u1srfvb6o, 77;uly5w5htr nucleus, the atomic mass number of twtrlry 1vu hu7s;6ug 557bf,o he 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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