## Decay Time |

The time required for the amplitude of a vibrating system to decrease to approximately 37% (or 1/e) of its initial value. For a system with a constant rate of damping, the decay is exponential and the decay time is independent of the initial amplitude.

Compare: Attack, Rate of Decay, Rise Time.

Exponential damping of a sine wave. Dashed line indicates exponential decay of the amplitude.