Question:
Energy band gap of an insulator is approximately:
Energy band gap of an insulator is approximately:
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Insulator = Huge Gap. Think of it as a jump too wide for electrons to cross, so no current flows.
Updated On: May 5, 2026
- 0 eV
- 0.1 eV
- Less than 3 eV
- Greater than 3 eV
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The Correct Option is D
Solution and Explanation
Step 1: Concept
The energy band gap ($E_g$) is the forbidden energy range between the valence band (filled with electrons) and the conduction band (empty).
Step 2: Meaning
This gap determines how easily electrons can move to the conduction band to allow electrical current.
Step 3: Analysis
In conductors, the gap is $0 \text{ eV}$ (bands overlap). In semiconductors, the gap is small (usually $< 3 \text{ eV}$). In insulators, the gap is very large, making it nearly impossible for electrons to jump to the conduction band at room temperature.
Step 4: Conclusion
Generally, materials with a band gap significantly greater than $3 \text{ eV}$ are classified as insulators. Final Answer: (D)
The energy band gap ($E_g$) is the forbidden energy range between the valence band (filled with electrons) and the conduction band (empty).
Step 2: Meaning
This gap determines how easily electrons can move to the conduction band to allow electrical current.
Step 3: Analysis
In conductors, the gap is $0 \text{ eV}$ (bands overlap). In semiconductors, the gap is small (usually $< 3 \text{ eV}$). In insulators, the gap is very large, making it nearly impossible for electrons to jump to the conduction band at room temperature.
Step 4: Conclusion
Generally, materials with a band gap significantly greater than $3 \text{ eV}$ are classified as insulators. Final Answer: (D)
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