JEE PHYSICS MCQ: SEMI CONDUCTOR DEVICES

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Identical piece of Ge and Cu are taken and cooled,
then:

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Correct option: D

Resistivity of Cu decreases and Ge increases

Option D (Resistivity of Cu decreases and Ge increases) is correct because copper is a metal whose resistivity decreases with decreasing temperature, while germanium is a semiconductor whose resistivity increases with decreasing temperature.

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

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N

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

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