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It's the physical property that indicates the degree/intensity of heat present in a substance or an object. It can be expressed and measured according to various scales.

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Can an extrinsic semiconductor have a positive temperature coefficient?

My professor says in his notes that, because electron mobility decreases when temperature increases high enough, the conductivity of an extrinsic semiconductor actually decreases at such temperatures. … What I want to know is: Is my professor justified in his claim that the resistance of an extrinsic semiconductor might increase with temperature? …
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