Strontium-90, a radioactive isotope, is a major product of an atomic bomb explosion. It has a half-life of 28.1 yr. (a) Calculate the first-order rate constant for the nuclear decay, (b) Calculate the fraction of 90 Sr that remains after 10 half-lives, (c) Calculate the number of years required for 99.0 percent of 90 Sr to disappear.
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