If the half-life of a radioisotope is 20,000 years, then a sample in which three-quarters of that radioisotope has decayed is ______ years old.
Introduction: Half-life is the time taken for one-half of atoms of radioactive isotope to decay which is a characteristic of a radioisotope. The radiometric dating is a technique by which the fossils or age of a rock can be determined using the half-life calculations.
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