Length Constant (𝜆)
the distance over which the voltage change generated by an injected current decays to \(\frac{1}{e}\) or around 37% of its original size (Vo)
Calculate Length Constant from Resistance and Capacitance
$$\lambda = \sqrt{\left(\frac{Resistance_{membrane}}{Capacitance_{membrane}}\right)}$$
Calculate Length Constant from Diameter
$$\lambda = \sqrt{\left(\frac{ \frac{1}{\pi * diameter} }{ \frac{4}{\pi * diameter^2} }\right)}$$