Posted by kelly on Tuesday, December 1, 2009 at 6:40pm.
If the time constant is T,
A(t) = A(0) e^(-t/T)
0.69 = e^(-15.5/T)
Take natural logs of both sides.
ln(0.69) = -0.3711 = -15.5/T
T = 41.8 s
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