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why does the electrical conductivity of semiconductors increse with rise in temperature?

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According to band model, the gap between conduction band and valence band on increasing temperature. Thus, they become more conducting as the temperature increases.
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Assertion (A) : The electrical conductivity of a semiconductor increases with increase in temperature. Reason (R ) : With increase in temperature, large number of electrons from the valence band can jump to the conduction band.

Statement I : Electrical conductivity of semiconductors increases with rise in temperature. Statement II : There is a small energy gap between conduction band and valence band.