Question :Assertion (A): The resistance of an intrinsic semiconductor decreases with an increase in its temperature.
Reason (R): The number of conduction electrons as well as hole increase in an intrinsic semiconductor with the rise in its temperature
The correct answer is -Both assertion (A) and reason (R) are partially correct.
The assertion (A) is correct. The resistance of an intrinsic semiconductor decreases with an increase in its temperature due to an increase in the number of charge carriers (both electrons and holes) in the material. As the temperature increases, more and more electrons and holes are generated, which increases the conductivity of the material and decreases its resistance.
The reason (R) is not entirely correct. Although the number of electrons and holes increases with temperature, the increase is not equal for both. In an intrinsic semiconductor, the number of electrons and holes is equal at absolute zero temperature, but as the temperature increases, the number of electrons increases more rapidly than holes. Therefore, the conductivity of the material increases more due to the increase in the number of electrons than the holes.
So, the correct answer is:
Assertion (A) is correct, but reason (R) is partially correct
