Physics Unit30: Nuclear Physics and Radioactivity (id: deeced075)

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]
If the half-life of ed+s 78b) zrqrxb( q5qa mc55hbu5 a ib h0vvyn)0aterial is 45 years, how much will be left after 100 years?bhv5 5vh0 5b0uc)nyia

A. more than 1/2
B. less than 1/2
C. more than 1/4
D. less than 1/4


参考答案:  D


本题详细解析: 暂无

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