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Biology 69 Online
OpenStudy (anonymous):

An animal fossil has 100 grams of carbon-14 initially within it. Knowing that these atoms radioactively decay to nitrogen-14 with a half-life of 5730 years, determine how much of the parent isotope and daughter isotope remain after 4 half-lives have transpired. How many years would have elapsed (in 4 half-lives)?

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