阿摩線上測驗
38. The Cs-131 nuclide has a half-life of 30 years. After 120 years, about 3 g remain. The original mass of the Cs-131 sample is closest to
(A) 96;
(B) 48;
(C) 36 ;
(D) 24 ;
(E) 12
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統計： A(0), B(1), C(0), D(0), E(0) #3507490
統計： A(0), B(1), C(0), D(0), E(0) #3507490
