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. (c) How much of a 1.00-mg sample of each
isotope remains after three half-lives?
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Master Half-Life Concept 1 with a bite sized video explanation from Jules Bruno