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?

Chemistry: Principles and Practice
3rd Edition
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Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
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Chapter13: Chemical Kinetics
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Problem 13.51QE: The half-life of tritium, 3H, is 12.26 years. Tritium is the radioactive isotope of hydrogen. (a)...
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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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