阿摩線上測驗
36. The cesium-137 nuclide has a half-life of 30 years. After 90 years, about 9 g remains. The original mass of the cesium-137 is closest to
(A) 70 g
(B) 50 g
(C) 90 g
(D) 80 g
答案：登入後查看
統計： A(3), B(0), C(3), D(1), E(0) #3577925
統計： A(3), B(0), C(3), D(1), E(0) #3577925
