The ratio of drift velocity to that of the thermal velocity of an electron in an conductor is -------------------------
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In three dimension, the thermal velocity of electron, vth = [3KT/m]1/2
drift velocity of electron, vd = eEτ/m
Thus,
vd/ vth = (eEτ/m)/[3KT/m]1/2
At room temperature(300K), value of thermal velocity, vth ∼ 105m/s
For E = 100V/m and average relaxation time at room temperature 10-13 s approx.
vd = 2m/s approx.
ratio vd / vth = 2x 10-5
drift velocity of electron, vd = eEτ/m
Thus,
vd/ vth = (eEτ/m)/[3KT/m]1/2
At room temperature(300K), value of thermal velocity, vth ∼ 105m/s
For E = 100V/m and average relaxation time at room temperature 10-13 s approx.
vd = 2m/s approx.
ratio vd / vth = 2x 10-5
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