When a semiconductor is heated,its resistance

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(A) In a semiconductor,the number of charge carriers (electrons and holes) increases exponentially with an increase in temperature due to the thermal

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Decreases

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(A) In a semiconductor,the number of charge carriers (electrons and holes) increases exponentially with an increase in temperature due to the thermal excitation of electrons from the valence band to the conduction band.Although the mobility of charge carriers decreases slightly due to increased scattering,the effect of the rapid increase in the number of charge carriers dominates.As a result,the conductivity of the semiconductor increases,which implies that its resistance decreases with an increase in temperature.

Similar Questions

In a semiconductor,

The Fermi level of energy of an intrinsic semiconductor lies:

What is the crystalline structure of an intrinsic semiconductor?

Assertion: If the temperature of a semiconductor is increased,then its resistance decreases.
Reason: The energy gap between the conduction band and the valence band is very small.

Consider the following statements regarding a semiconductor:
$(A)$ There are no free electrons at $0 \ K$.
$(B)$ There are no free electrons at any temperature.
$(C)$ The number of free electrons increases with temperature.
$(D)$ The number of free electrons is less than that in a conductor.

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