The Fermi-Dirac statistic describes the probability of occupation of an energy state E, as a function of temperature and of the parameter Ef, the Fermi energy. a) What is the physical interpretation for the result obtained when E = Ef? b) Under which conditions of temperature and position of the Fermi level, Ef, can the Fermi-Dirac statistic be written as a simple exponential? Justify your answer.

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