Half-life and decay constant (id: 0ca11b9ab)

本题目来源于试卷: Half-life and decay constant，类别为 美国物理杯赛(Physics Bowl)

[单选题]
04.06: Radon gas emits g*.ko oz 1tm;a5z kats/ijub*/amma a 4sqan5q0oz k saj w*1(o:gg-rays and is used in hospitals to treat cancer. Its half-life is about 3.8 days. Starting with a pure sample of radon, the pa 5 s *1:(sg4g0wzoonjk-qqaa ercentage left after 19 days will be about

A. 0 %
B. 3 %
C. 5 %
D. 9 %
E. 20 %


参考答案:  B


本题详细解析: 暂无

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