Use equation (14.2) to make a semilog plot of conduction electron concentration versus (1/kT) for intrinsic (pure) silicon. The conduction electron concentration in Si at T=293 K (room temperature) is 1010 cm−3. (b) Below what temperature are there essentially no charge carriers in pure Si (say, less than one carrier per cm3 )? (c) Is there some temperature below the melting point of Si (Tmelting =1690 K ) at which the conduction electron concentration in Si is comparable to that of a metal?