Question

How is relaxation time related to the drift velocity of free electrons​

Answer 1

Answer:

The small average velocity of free electrons along the direction of positive potential is called the drift velocity. Drift velocity is denoted by vd. ii) Relaxation time: The time for which an electron moves freely between two successive collisions of electron with lattice ions/atoms is called the relaxation time.

Explanation:

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Answer 2

Answer:

I have two contradicting views for this.

First, we can say that increasing the temperature of the conductor will increase the kinetic energy of the electrons. Hence, their drift velocity should increase with increase in temperature.

Or, from the relation vd=eEmT (T is the relaxation time) we can say that the drift velocity is directly proportional to the relaxation time. Increasing the temperature will obviously decrease the relaxation time - as collisions will become more frequent - and thus decrease the drift velocity. Hence, an increase in the temperature will cause a decrease in the drift velocity.

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