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A material with a band gap above three electron volts is an:

AAlloy one
BAmplifier
CInsulator
DConductor
Answer & Solution
Correct answer: C. Insulator
1. Room temperature energy cannot lift electrons that far. 2. The conduction band therefore stays empty. 3. Such a material is an insulator. 4. So the answer is insulator. _Source: syllabus Physics, Ch 14 'Semiconductor Electronics'_
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