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Title: If the half-life of a radioactive isotope is 3 million years... Post by: sary on Apr 23, 2014 If the half-life of a radioactive isotope is 3 million years what percent of the isotope is left after 9 million years.
Title: Re: If the half-life of a radioactive isotope is 3 million years... Post by: dicklonghorn on Apr 26, 2014 There will be 1/8th or 12.5% of the isotope left after 9 million years because that is enough time for 3 half lives. (1/2)*(1/2)*(1/2)=1/8=12.5%.
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