Americium-241 is used in smoke detectors. It has a rate constant for radioactive decay o...

Americium-241 is used in smoke detectors. It has a rate constant for radioactive decay of 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. (a) What are the half-lives of these two isotopes? (b) Which one decays at a faster rate? (c) How much of a 1.00-mg sample of either isotope remains after three half-lives?