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How many half-lives would have to elapse for a sample of a radioactive isotope to decrease from an activity of 96 cpm to an activity of 3 cpm?

Answer:
It takes 5 half lives. The sample has been reduced to 3/96 or 1/32 of its original activity. This is 1/2 to the power of 5.
First answer by GeoHarvey. Last edit by GeoHarvey. Contributor trust: 261 [recommend contributor recommended]. Question popularity: 1 [recommend question].

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