What is relaxation time?

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(N/A) Relaxation time,denoted by $\tau$,is defined as the average time interval between two successive collisions of free electrons in a conductor.
When an electric field is applied to a conductor,the free electrons undergo random motion and collide with the positive ions of the lattice.
The time elapsed between two such consecutive collisions is known as the relaxation time.
It is typically of the order of $10^{-14} \ s$.

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