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The electrical conductivity of a metal d...

The electrical conductivity of a metal decreases with rise in temperature while that of semi-conductor increases. Justify.

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In case of metals, with increase of temperature the kernals start vibrating and thus offer resistance of the flow of electrons . Hence, conductivity decreases. In case of semiconductors , with increase of temperature more electrons can shift from valance band to conduction band. Hence, conductivity increases.
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