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 Mar4 awarded Notable Question Feb3 awarded Popular Question Nov16 awarded Popular Question Oct23 awarded Notable Question Oct4 awarded Popular Question Jul2 awarded Curious May29 awarded Famous Question May12 awarded Notable Question Feb14 awarded Popular Question Feb13 accepted Deriving demand functions given utility Feb13 accepted Exponential decay and time constants Feb13 accepted Modelling differential equations Feb13 accepted Time constants and steady states of decaying quantities Feb11 asked Exponential decay Feb6 revised Time constants and steady states of decaying quantities added 38 characters in body Feb6 asked Time constants and steady states of decaying quantities Feb4 comment Exponential decay and time constants @StefG Thanks for the link! I'm just a little confused because their proof uses integration by parts and not $t = \tau$ to show that the mean lifetime or time constant is related to the decay rate: en.wikipedia.org/wiki/… Feb4 asked Exponential decay and time constants Jan30 comment Modelling differential equations Thanks. I think $r =\frac{r_0}{2}$, this gives me $\lambda = \frac{ln(2)}{5230}$. Also, if Iodine 131 has a half-life of 8 days, does that mean $t = \frac{8}{365}$? Jan30 asked Modelling differential equations