For an insulator at room temperature, the conduction band is __________.
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A.
partially filled
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B.
absent
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C.
completely filled
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D.
empty
Correct Answer:
D. empty
Explanation:
The conduction band of an insulator is empty at room temperature. In insulating materials, there is a substantial energy gap, known as the forbidden band, between the valence band and the conduction band. At room temperature, the thermal energy available is insufficient to excite electrons from the valence band across this wide gap. Consequently, no electrons are present in the conduction band to facilitate electrical flow, while the valence band remains completely occupied. This lack of charge carriers in the conduction band is what prevents insulators from conducting electricity under normal conditions.
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