SOLUTION: Suppose you begin with 2.8 mg of a pure radioactive substance and 3.6 h later determine that 0.35 mg remain. What is the half-life of the substance?

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 Question 428542: Suppose you begin with 2.8 mg of a pure radioactive substance and 3.6 h later determine that 0.35 mg remain. What is the half-life of the substance?Answer by Gogonati(817)   (Show Source): You can put this solution on YOUR website!Solution:As we know the radioactive decay is given by: where M is th actual mass of the substance, Mo is the mass after t= 3.6 h, and k is decay coefficient. Substitute our values: , Take ln for both sides. k=-0.212 Now that, we know the coefficient of half-life, can compute the half-life. , Take ln for both sides. h.