Question

In energy band diagram of insulators, a band gap and the conduction band is respectively

• A. very high, empty.
• B. very low, partially filled.
• C. very high, completely filled.
• D. very low, empty.

Hint:

In insulators, the band gap is large enough that electrons cannot jump to the conduction band, making the conduction band empty.

Answer 1

The Correct Option is A

Step 1: Understanding the band gap.
In insulators, the band gap between the valence band and the conduction band is very high, making it difficult for electrons to move into the conduction band. This is why insulators do not conduct electricity.
Step 2: Analyzing the options.
- (A) very high, empty: Correct, because in insulators, the conduction band is empty, and the band gap is large. - (B) very low, partially filled: Incorrect, this describes conductors or semiconductors. - (C) very high, completely filled: Incorrect, the conduction band remains empty in insulators. - (D) very low, empty: Incorrect, the band gap is high, not low.
Step 3: Conclusion.
The correct answer is (A), because insulators have a very high band gap and an empty conduction band.