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'''Exponential decay''' is the decay of a physical property whose value goes as
<math>A = A_0 e^{-(t-t_0)/\tau}</math>
where <math>A_0</math> is the value at time <math>t_0</math> and <math>\tau</math> expresses the rate of exponential decay. The quantity reaches one-half of its original value after a time interval equal to <math>\tau</math> ln 2, which is called its [[half-life]].
[[Category:Physics]]
<math>A = A_0 e^{-(t-t_0)/\tau}</math>
where <math>A_0</math> is the value at time <math>t_0</math> and <math>\tau</math> expresses the rate of exponential decay. The quantity reaches one-half of its original value after a time interval equal to <math>\tau</math> ln 2, which is called its [[half-life]].
[[Category:Physics]]