NEET Physics Question - Semiconductor Physics - Properties of Semiconductors

Assertion (A): The temperature coefficient of resistance is positive for metals and negative for semiconductors.

Reason (R): On raising the temperature, in metals drift velocity increases but in semiconductors more charge carriers are released.

Both (A) & (R) are true and the (R) is the correct explanation of the (A)

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(A) is true but (R) is false

Both (A) and (R) are false

Solution:

Concept: Temperature dependence of resistance.
Metals have a positive temperature coefficient of resistance, while semiconductors have a negative one, so (A) is true. In metals, drift velocity *decreases* with increasing temperature due to increased scattering. In semiconductors, carrier concentration increases, so (R) is false.

Rankers Physics

Temperature Coefficient of Resistance

Solution:

Leave a Reply Cancel reply