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20. The number of a certain radioactive nuclide present in a sample decays from 2.41 x 10² to 6.02 x 10¹ in 30 minutes. What is the half-life of this radioactive species?
(A) 2.0 x 10¹ minutes
(B) 2.4 x 10² minutes
(C) 1.5 x 10¹ minutes
(D) 6.0 x 10² minutes
(E) 1.0 x 10¹ minutes
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統計： A(0), B(0), C(4), D(0), E(0) #3278695
統計： A(0), B(0), C(4), D(0), E(0) #3278695
