31. (a) Since the electron jumps from the conduction band to the valence band, the energy of the photon equals the energy gap between those two bands. The photon energy is given by hf = hc/λ, where fis the frequency of the electromagnetic wave and λis its wavelength. Thus, Eg= hc/and λ==×⋅××=×
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This note was uploaded on 05/19/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.