*21. (Ill) Suppose that a silicon semiconductor is doped
Chapter 29, Problem 21(choose chapter or problem)
*21. (Ill) Suppose that a silicon semiconductor is doped with phosphorus so that one silicon atom in 106 is replaced by a phosphorus atom. Assuming that the extra' electron in every phosphorus atom is donated to the conduction band, by what factor is the density of conduction electrons increased? The density of silicon is 2330 kg/m\ and the density of conduction electrons in pure silicon is about l()Ulm 3 at room temperature.
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