Question:
In semiconductors, at room temperature the
In semiconductors, at room temperature the
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Thermal energy lifts a few electrons from the valence band to the conduction band.
Updated On: Nov 12, 2026
- valance band is partially empty and the conduction band is partially filled.
- valance band is completely filled and the conduction band is partially filled.
- valance band is completely filled.
- conduction band is completely empty.
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
At absolute zero a pure semiconductor has a completely filled valence band and an empty conduction band.
Step 2: Effect of Temperature
At room temperature thermal energy excites some electrons across the small band gap.
These electrons leave vacancies (holes) in the valence band and occupy states in the conduction band.
Step 3: Compare the options
So the valence band is partially empty and the conduction band is partially filled, option (A).
The other options describe the situation at absolute zero or a metal.
Final Answer:
At room temperature the valence band is partly empty and the conduction band is partly filled. \[ \boxed{\text{(A) }\text{valance band is partially empty and the conduction band is partially filled}} \]
At absolute zero a pure semiconductor has a completely filled valence band and an empty conduction band.
Step 2: Effect of Temperature
At room temperature thermal energy excites some electrons across the small band gap.
These electrons leave vacancies (holes) in the valence band and occupy states in the conduction band.
Step 3: Compare the options
So the valence band is partially empty and the conduction band is partially filled, option (A).
The other options describe the situation at absolute zero or a metal.
Final Answer:
At room temperature the valence band is partly empty and the conduction band is partly filled. \[ \boxed{\text{(A) }\text{valance band is partially empty and the conduction band is partially filled}} \]
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