If the effective mass of holes is greater than the effective mass of electrons in semiconductor material, Question 3 options: the intrinsic Fermi energy is slightly above the center of the bandgap. the bandgap is wider than it would be if the situation were reversed. there is no effect on the intrinsic Fermi energy level. the intrinsic Fermi energy is slightly below the center of the bandgap.

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater