Question

A radioactive isotope has a half life of 8.1 days. If the sample starts with 25 grams, how much will there be after 90 days?

Nov 3, 2014

90 days is 90/8.1 = 11.111 half-lives, so there would be

25*(1/2)^11.111 left

Nov 4, 2014

THANK YOU!!

Nov 4, 2014

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