A radioactive substance decays exponentially: The mass at time t is m(t) = m(0)ekt, where m(0) is the initial mass and k is a negative constant. The mean life M of an atom in the substance is M = -k 00 tekt dt. For a radioactive isotope, the value of k is -0.000168. Find the mean life of the isotope's atom. (Round your answer to one decimal place.) (No Response) yr

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