Find the conductivity of silicon (a) in intrinsic condition at a room temperature of 300 K, (b) with donor impurity of 1 in 108, (c) with acceptor impurity of 1 in 5 x 107 and (d) with both the above impurities present simultaneously. Given that n for silicon at 300 K is 1.5 x 100 -3 cm, H = 1300 cm/V-s, = 500 cm/V-s, number of Si atoms per cm = 5 123 x 10.