In semiconductors at room temperature, (a) the valence band is completely filled and the conduction band partially filled. (b) the valence band is completely filled. (c) the conduction band is completely filled. (d) the valence band is partially empty and the conduction band partially filled.

Answer: (d). Small band gap ( ~ 1 eV) lets some valence electrons jump to the conduction band at room temperature. This leaves holes in the valence band (partially empty) and electrons in the conduction band (partially filled). So the answer is (d).

In semiconductors at room temperature, | MHT CET 2024 (10 May, Shift 2)

Q5MHT CET 2024 · 10 MAY · SHIFT 2Easy

Energy Bands in Solids

In semiconductors at room temperature,

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Answer: (d)

Small band gap ( $\sim 1\text{ eV}$ ) lets some valence electrons jump to the conduction band at room temperature.
This leaves holes in the valence band (partially empty) and electrons in the conduction band (partially filled).
So the answer is (d).

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