If Forty percent of a radioactive substance decays in five years. By what percent does the substance decay each year?
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Originally Posted by Royster123 If Forty percent of a radioactive substance decays in five years. By what percent does the substance decay each year? Exponential Decay: $\displaystyle N(t) = N_0e^{-\lambda t}$ $\displaystyle 0.6 = 1e^{-40\lambda}$ $\displaystyle \lambda = -\frac{1}{40}ln(0.6)$ $\displaystyle N(t) = 1e^{-\left(-\frac{1}{40}ln(0.6)\right) \times 1)}$
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