JEE PHYSICS MCQ: SEMI CONDUCTOR DEVICES

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A piece of copper and another of germanium are cooled from temperature to

80^\circ \,K.

The resistance of

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Correct option: D

Copper decreases and germanium increases

Option D (Copper decreases and germanium increases) is correct because copper is a metal and its resistance decreases with decreasing temperature, while germanium is a semiconductor and its resistance increases with decreasing temperature.

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A PN-junction has a thickness of the order of In a

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\mathrm{\alpha\; and\; \beta }

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