The ratio of parent to daughter isotopes in a radioactive decay process is 0.40. How many half- lives have elapsed since the material was 100% parent atoms?
A)less than l
B)between l and 2
C)between 2 and 3
D)more than 3

Name: The ratio of parent to daughter isotopes in a radioactive decay process is 0.40. How many half- lives have elapsed since the material was 100% parent atoms? A)less than l B)between l and 2 C)between 2 and 3 D)more than 3
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The Answer is B

The Ratio of Parent to Daughter Isotopes in a Radioactive