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In semiconductors, at room temperature

1. the conduction band is completely empty
2. the valence band is partially empty and the conduction band is partially filled
3. the valence band is completely filled and the conduction band is partially filled
4. the valence band is completely filled

Correct answer: the valence band is completely filled and the conduction band is partially filled

Solution

At room temperature, some electrons in a semiconductor gain enough thermal energy to jump from the valence band to the conduction band, leaving the valence band completely filled and the conduction band partially filled.

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