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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