Question:
In semiconductors, at room temperature
In semiconductors, at room temperature
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At room temperature thermal energy lifts a few electrons across the small energy gap of a semiconductor.
Updated On: Nov 12, 2026
- the valence band is completely empty.
- the conduction band is completely empty.
- The valence band is partially empty and the conduction band is partially filled.
- the valence band is completely filled and the conduction band is partially filled.
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
At 0 K a semiconductor has a completely filled valence band and an empty conduction band, with a small gap between them.
Step 2: Effect of room temperature
Thermal energy lifts some electrons from the valence band to the conduction band.
Step 3: Result
The conduction band is now partially filled and the valence band is partially empty because of the holes left behind.
Final Answer:
At room temperature the valence band is partially empty and the conduction band is partially filled. \[ \boxed{\text{(C) }\text{The valence band is partially empty and the conduction band is partially filled.}} \]
At 0 K a semiconductor has a completely filled valence band and an empty conduction band, with a small gap between them.
Step 2: Effect of room temperature
Thermal energy lifts some electrons from the valence band to the conduction band.
Step 3: Result
The conduction band is now partially filled and the valence band is partially empty because of the holes left behind.
Final Answer:
At room temperature the valence band is partially empty and the conduction band is partially filled. \[ \boxed{\text{(C) }\text{The valence band is partially empty and the conduction band is partially filled.}} \]
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