If the half-life of a radioactive isotope is 7,000 years and the amount of the parent isotope present in an igneous rock is only one-fourth of the original amount, how old is the rock?

Question

03-05-2022
Physics

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If the half-life of a radioactive isotope is 7,000 years and the amount of the parent isotope present in an igneous rock is only one-fourth of the original amount, how old is the rock?

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