Of an original amount of radioactive parent isotope, 25% remains and 75% has decayed.How many half-lives have elapsed?
A)2.0
B)0.5
C)1.5
D)3.0

Name: Of an original amount of radioactive parent isotope, 25% remains and 75% has decayed.How many half-lives have elapsed? A)2.0 B)0.5 C)1.5 D)3.0
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Question

Quizplus · Accepted Answer

After one half-life, 50% of the original amount would remain. After two half-lives, this amount would halve again, leaving 25% of the original amount. Therefore, two half-lives have elapsed.

Of an Original Amount of Radioactive Parent Isotope, 25% Remains