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a) The room temperature conductivity of sodium is 2.0 x 107 (Qm)'1 so that the residual conductivity of the purest specimen is 5.3 x 1010

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a) The room temperature conductivity of sodium is 2.0 x 107 (Qm)'1 so that the residual conductivity of the purest specimen is 5.3 x 1010 (0m)'1. Deduce estimates of the collision time I at T=0 K and at room temperature respectively. Take electron concentration, n= 2.7 x 1028 m-3 and m= mass of electron me. b) What is the mean collision time due to phonon (assuming no impurity)

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