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In terms of band theory, what is the dif...

In terms of band theory, what is the difference
(i) between a conductor and an insulator
(ii) betweeen a conductor and a semiconductor?

Text Solution

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(i) The energy gap between the valence band and conduction band in an insulator is very large whereas in a conductor, the energy gap is very small or there is overlapping between valence band and conduction band.
(ii) In a conductor, there is very small energy gap or there is overlapping between valence band and conduction band but in a semiconductor there is always a small energy gap between them.
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