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A solid behaves as an insulator when its energy band gap is roughly:
AGreater than 3 eV
BOnly about 0.01 eV
CZero, bands overlap
DBetween 0.5 and 1 eV
Answer & Solution
Correct answer: A. Greater than 3 eV
With a gap above about 3 eV, thermal energy cannot lift electrons into the conduction band.
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