問題詳情

9.
The first-order decay of radon has a half-life of 3.823 days. How many grams of radon remain after 7.65 days if the sample initially weighs 500.0 grams?
(A) 4.21 g
(B) 250 g
(C) 109.6 g
(D) 100 g
(E) 125 g

參考答案

答案：E

統計：A:0,B:0,C:0,D:0,E:0

難度：計算中