18. A radioactive substance decays exponentially: The mass at time is m (t) = m (0) ekt, where m(0) is the initial mass and k is a negative constant. The mean life of an atom in the substance is ∞ M =-k St tekt dt 0 For the radioactive carbon isotope, ¹4C (Carbon-14), used in radiocarbon dating, the value of k is -0.000121. Find the mean life of a ¹4C atom.

Q: Please answer both

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