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Energy gap (band gap) of pure silicon at room temperature:
A5 eV (insulator)
B≈ 1.1 eV
C0 eV
D12 eV
Answer & Solution
Correct answer: B. ≈ 1.1 eV
Si band gap ≈ 1.1 eV. Ge: 0.7 eV. GaAs: 1.43 eV. Small enough that thermal energy can promote some electrons to conduction band at room temperature → semiconducting.
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