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A cube of germanium of side 10 mm conducts a current of 6.4 mA when a...

A cube of germanium of side 10 mm conducts a current of 6.4 mA when a voltage of 10 mV is applied between two of its parallel faces. If the charge carriers have mobility of 0.39 m2V-1sec-1, calculate the density of charge carriers. What is the time t between collisions if the charge carrier effective mass is 0.12me, where me is the mass of a free electron ?

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