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]
97.25: Originally there are N atoms of an unstable isotop gt-adq5b(s gir (v .4-x2krgbe. Afg 0zu ulxxhoqi7+bd5: ar;y .)ter 20 minutes, only 1/16 of them have not decayed. What is the half life of thuxzi+oxh;0lrudq ga).y7 b5:e isotope?
A. 10 minutes
B. 5 minutes
C. 4 minutes
D. 2 minutes
E. 1 minute
参考答案: B
本题详细解析:
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