The forbidden energy gap for a conductor is .

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The type of bonding in germanium is ionic.

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The type of bonding in sodium chloride is covalent.

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Electrons are majority carriers in p-type semiconductor.

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Holes are majority carriers in n-type semiconductor.

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In an intrinsic semiconductor electrons are the only charge carriers.

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Addition of trivalent impurity to germanium crystal converts it to an n-type semiconductor.

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The conductivity of a semiconductor increases with rise of temperature.