[单选题]
A radioactive sample of gas has a half-life of 100 seconds. If there are initially 10000 of these gasmolecules in a closed container, approximately how many of the molecules remain after a time of 250 seconds elapses?
A. 2500
B. 2190
C. 1770
D. 1560
E. 1250
参考答案: C
本题详细解析: $N(T)=N_0 (\frac{t}{(\frac{1}{2} half life t})$
