# Americium-241 is used in smoke detectors. It has a first order rate constant for radioactive decay of k = 1.6*10-3 yr-1. By contrast, iodine-125, which is used to test for thyroid functioning, has a rate constant for radioactive decay of k = 0.011 day-1.How much of a 1.00 mg sample of americium-241 remains after 3 half-lives?

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Americium-241 is used in smoke detectors. It has a first order rate constant for radioactive decay of k = 1.6*10-3 yr-1. By contrast, iodine-125, which is used to test for thyroid functioning, has a rate constant for radioactive decay of k = 0.011 day-1.

How much of a 1.00 mg sample of americium-241 remains after 3 half-lives?

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Step 1

Half-life of americium-241 is 432.2 years

Therefore,...

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