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Math Help - Exponential decay with many rates

  1. #1
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    Exponential decay with many rates

    The general model for an exponential decay is:

    M(t) = M_0 e^{-\lambda t},

    where \lambda is the decay rate. There exist natural process with multiple decay rates, also known as decay modes, which transform the model above into the following:

    M(t) = M_0 e^{-(\lambda_1 + \lambda_2 + \dots + \lambda_{n}) t},

    My question is simple: does anyone know of any examples involving many decay constants? Equivalent examples for the exponential growth case are equally appreciated.
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  2. #2
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    Has anybody ever encountered a problem (both in social and natural sciences) related to multiple rates of exponential growth or decay?
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