Physics Unit30: Nuclear Physics and Radioactivity (id: 19ea865bc)

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]
A radioactive sample has a half-life of 10 min. un9 e9n+ lbj.qaz(fr;rs ) m5mWhat fraction of tj pnd.b r95-ophe sample is left -9 njdbpo.r5pafter 40 min?

A. 1/2
B. 1/4
C. 1/8
D. 1/16


参考答案:  D


本题详细解析: 暂无

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