If the half-life of an unstable isotope is 10,000 years, and only 1/8 of the radioactive parent remains in a sample, how old is the sample?

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asked May 11, 2018 99.6k views

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Neilprosser · Answer 1 · 2018-05-16T23:11:23+0000

Have in mind that a radioactive half-life is the amount of time it takes for half of a sample to decay. So, if the amount remaining after x half-lives is (1/2)↑x times the amount you started with. So for 1/18 of radioactive parent then (1/2)↑6 equals 30,000 years

If the half-life of an unstable isotope is 10,000 years, and only 1/8 of the radioactive parent remains in a sample, how old is the sample?

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