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Si is doped with 9.4 x 1016 cm-3 phosphorous atoms. At a temperature of 52 K,...

Si is doped with 9.4 x 1016 cm-3 phosphorous atoms. At a temperature of 52 K, the semiconductor is in it's the freezeout region. The state produced in the bandgap by these donors is 0.05 eV below the conduction band minimum. The effective mass of the electrons is 1.2. What is the free electron concentration at this temperature in m-3? (Answer format X.XEX)

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