Question

Q.22 With increase in temperature the conductivity of (1) metals increases and of semiconductor decreases. (2) semiconductors increases and of metals decreases. (3) in both metals and semiconductors increases. (4) in both metal and semiconductor decreases.​

Answer 1

Answer:

The electrical conductivity of a metal decreases with rise in temperature while that of a semiconductor increases.

Hence, conductivity decreases. In case of semiconductors, with increase of temperature , more electrons can shift from valence band to conduction band. Hence, conductivity increases.