4. Consider the energy levels shown in below Figure. Let T = 300 °K. (a) If E₁ - EF = 0.30 eV determine the probability that an energy state at E = E₁ is occupied by an electron and the probability that an energy state at E = E2₂ is empty. (b) Repeat part (a) if EF - E₂ = 0.40 eV. 1.12 eV E₁ EF E₂
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