1. 1.
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    In an n-type silicon, the donor concentration corresponds to 1 atom per 10^7 silicon atoms, the electron effective mass is 0.33 m0. Calculate: (a) the concentration of donor atoms,
    (b) The Fermi level with respect to the conduction band edge at room temperature, (c) if the
    Fermi level coincide with Ec, what should be the concentration of donors?
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