Question

Assertion (A) : The resistance of an intrinsic semiconductor decreases with increase in its temperature. Reason (R) : The number of conduction electrons as well as hole increase in an intrinsic semiconductor with rise in its temperature.

How does the conductivity of an intrinsic semiconductor vary with temperature ? Explain. Show the variation in a plot.

At 0 K, the resistivity of an intrinsic semiconductor is :

Distinguish between intrinsic and extrinsic semiconductors. Although in an extrinsic semiconductor nₑ ≠ nₕ, yet it is electrically neutral. Why ?