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 gammah5 rc/2fl8vrq rays and is us9rz)s/ 7/p1xecrysy1 /lfec x ed in hospitals to treat cancer. Its half-life is about 3.8 days. Starting with a pure sample of radon, the percentagzy ye/s e7frr1 cl/x/ c9sp1x)e 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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