At room temperature the semiconductor Si has an energy gap of AE = 1.12 eV, that separates the valence band from the conduction band. (a) (b) (c) Calculate the ratio of the number of electrons in the higher energy level (conduction band) to the number in the lower energy level (valence band) at room temperature. What is the ratio, if the temperature is increased to T = 2000 K? What effect has a smaller band gap on thermal occupation?

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