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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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Knowledge Check

  • The electrical resistance of the following decreases with rise in temperature

    A
    Metals
    B
    Semiconductor
    C
    Gold
    D
    Constantan

  • With decrease in temperature, resistivity of a conductor

    A
    increases
    B
    decreases
    C
    remains the same
    D
    first increases then decreases

  • Electrical conductivity of semiconductor A… with rise in temperature . Here , A refers to

    A
    Increases
    B
    Decreases
    C
    Both a and b
    D
    Remains unchanged

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