Potassium-40 has a half-life of approximately 1.25

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Potassium-40 has a half-life of approximately 1.25 billion years. Approximately how many years will pass before a sample of potassium-40 contains one-sixteenth the original amount of parent isotope?
13 years ago

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The following answers were posted by visitors named Potassium-40 has a half-life of approximately 1.25.