4.已知ta為平均壽命(meanlife),Ao為初始活度,No為初始原子核數量。試問taxAo,為何?
(A)0.37No
(B)0.5No
(C)0.63No
(D)No
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統計: A(284), B(100), C(290), D(1303), E(0) #2406404
統計: A(284), B(100), C(290), D(1303), E(0) #2406404