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Question: Answered & Verified by Expert
The magnitude of the energy gap for an insulator is
PhysicsSemiconductorsJEE Main
Options:
  • A less than $1 \mathrm{eV}$
  • B between $2 \mathrm{eV}$ to $3 \mathrm{eV}$
  • C more than $3 \mathrm{eV}$
  • D between $1 \mathrm{eV}$ to $2 \mathrm{eV}$
Solution:
1658 Upvotes Verified Answer
The correct answer is: more than $3 \mathrm{eV}$
In an insulator, there exists a large band gap between conduction band and valence band $\mathrm{Eg}(\mathrm{Eg}\gt3 \mathrm{eV}$ ), that results in no free electrons in the conduction band, and therefore no electrical conduction is possible.

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