First slide
Classification of semi-conductors
Question

Statement I: The resistivity of a semiconductor increases with temperature.
Statement II: The atoms of a semiconductor vibrate with larger amplitude at higher temperatures, thereby increasing its resistivity.

Moderate
Solution

The temperature coefficient of resistance of semiconductors is negative, that is, their electrical resistance decreases (or conductivity increases) with rise in temperature.

Note: At absolute zero, a semiconductor becomes an ideal insulator.

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