(a) Calculate the conductivity of a piece of intrinsic silicon at 300 K, if it has an intrinsic carrier density of 1.60 x 1016 m-3. Take into account conduction by both electrons and holes.
(b) What would be the conductivity of a piece of extrinsic silicon at 300 K which has been doped p-type with a number density of acceptors equal to 6.30X10^21 m -3 , assuming it has an intrinsic carrier density of 1.60 X 1016 m-3?
(c) Suppose a current of 50.0 mA is passed through a piece of the silicon in (b). How much of this current is carried by the electrons, and how much by the holes?