A mathematical model for the decay of radioactive substances is given by Q=Qe where Q = amount of the substance at time t=0, r= continuous compound rate of decay, t= time in years, and Q = amount of the substance at time t. An isotope has a half-life of 41 years. What is the continuous compound rate of decay? The continuous compound rate of decay is r=₁ (Type an integer or decimal rounded to four decimal places as needed.)

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