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]
94.24: A sample of rad5rxezqil7s; .)/5k jem28z t x ;gn8xd0mjhbg ioactive material has an iik(d.w9ha ziq.7f n .znitial activity of 10,000 counts/minute. 30 minutes later, its activity is 2,500 countzq f( .9ik7nz.id.whas/minute. The half-life of the material is:
A. 7.5 minutes
B. 10 minutes
C. 15 minutes
D. 20 minutes
E. 22 minutes
参考答案: C
本题详细解析:
暂无
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