問題詳情

39.An experiment with

takes 47.5 hours. At the end of the experiment, 1.90 ng of

remains. If the half life is 180 hours, how many ng of

were originallypresent?
(A) 2.47 ng
(B) 3.05 ng
(C) 3.28ng
(D)11.8 ng

參考答案

答案：D
難度：計算中-1
書單：沒有書單，新增