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<math>\begin{align}
N(t) = N_{0}e^{-\lambda t} \\
\frac{N_{0}}{N(t)} = e^{\lambda t} \\
\frac{N_{0}}{N(t)} - 1 = e^{\lambda t} - 1\\
\frac{N_{0} - N(t)}{N(t)} = e^{\lambda t} - 1\\
t = \frac{1}{\lambda} ln(\frac{N_{0}-N(t)}{N(t)} + 1)\\
\end{align} </math>

Revision as of 06:44, 15 August 2011