Consider silicon at T 300 K with donor concentrations of Nd 1014, 1015, 1016, and 1017, cm3. Assume Na 0. (a) Calculate the position of the Fermi energy level with respect to the conduction band for these donor concentrations. (b) Determine the position of the Fermi energy level with respect to the intrinsic Fermi energy level for the donor concentrations given in part (a).

An open feedwater heater operates at steady state with liquid entering at inlet 1 with t? = 40°c and pl = 1 .2 mpa. water vapor att2-200°c and p2 = 1.2 mpa enters at inlet 2. saturated liquid water exits with a pressure of pa 1.2 mpa. neglect heat transfer with the surroundings and all kinetic and potential energy effects, determine the mass flow rate of steam at inlet 2 if the mass flow rate of liquid water at inlet 1 is given as 2 kg/s.