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For insulators, the energy gap is stated as being greater than:
ANine electron volts
BSeven electron volts
CTwelve electron volts
DThree electron volts
Answer & Solution
Correct answer: D. Three electron volts
1. The size of the band gap separates the three classes of solid.
2. Insulators have the largest gap of the three.
3. For insulators the energy gap is greater than 3 eV.
4. For semiconductors it runs from 0.2 eV to 3 eV.
_Source: NCERT Class XII Physics Part II, Ch 14 'Semiconductor Electronics'_
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