The element niobium (Nb) has a Fermi energy of 5.32 eV. The width of the conduction band is 14.96 eV. The electrons in Nb have an effective mass of 2.4 me. Consider a 10 cm 10 cm 10 cm block of Nb. a) Determine the number of electrons in this block that are in the 4d shell. Now determine the number of electrons with an energy greater than the Fermi energy if b) T = 0K (trick question?) c) T = 300K d) T = 2750K