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The activation energy for a Schottky defect is 2.7 eV. At what temperature Kelvin will the fraction of vacant sites equal 4.6x10-13? Assume the pre-exponential

The activation energy for a Schottky defect is 2.7 eV. At what temperature Kelvin will the fraction of vacant sites equal 4.6x10-13? Assume the pre-exponential factor to be 1

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