October 2020 1 446 Report
após 15min de observação , a massa da amostra de um isotopo radiativo, que era 72 mg, torna-se 9 mg.Determine a meia-vida desse isotopo.
(A) 3 min
(B) 5 min.
(C) 6 min.
(D) 10 min.
(E) 15 min.
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