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Mechanism of Carrier Conduction

The valence b...

Question

The valence band of a semiconductor at 0 K is

A

completely filled

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B

completely empty

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C

partially filled

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D

nothing can be said

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Solution

The correct option is A completely filled
At 0 K, thermal energy is zero, valence band is completely filled.

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In insulators, the valence bands are completely and the large band gap prevents the promotion of electrons to empty space whereas in semiconductor band gap is low.

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Q. Assertion :In some solids, the valence band is completely filled while the next higher band separated by an energy gap of few electrons-volts is completely empty. Reason: In insulators the energy band completely filled with electrons( the valence band) and above it is empty band (the conduction band)

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