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A sample of a radioactive isotope of an element contains 100 million atoms and is found to have a decay rate of 6 hundred atoms

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A sample of a radioactive isotope of an element contains 100 million atoms and is found to have a decay rate of 6 hundred atoms per year. What is the half-life of the isotope? (Give your answer correct to at least two decimal places.) 11.55 X thousand years

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