NEET Physics Question - Current Electricity - Variation of Resistance with Temperature

Assertion (A): The resistivity of a semiconductor decreases with increase in temperature.

Reason (R): In a conductor, the rate of collisions between free electrons and ions increases with increase of temperature.

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:

Assertion (A) is true. Increased temperature in semiconductors generates more charge carriers, decreasing resistivity. Reason (R) is also true, as thermal vibrations increase electron-ion collisions in conductors, increasing resistivity. However, (R) explains conductors, not semiconductors, so it's not the correct explanation for (A).

Rankers Physics

Semiconductor Resistivity and Temperature

Solution:

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