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1. Assertion (A): Relaxation time and mean time between collisions are equal when scattering is isotropic.Reason (R): Mean free path of an electron λ, velocity of electron v and mean time between collisions t c are related as λ = vTc.
(A): A is false but R is true
(B): A is true but R is false
(C): Both A and R are true and R is correct explanation of A
(D): Both A and R are true but R is not correct explanation of A
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