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In order that the heat flows from one part of a solid to another part, what is required?

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In order that the heat flows from one part of a solid to another part, what is required?

(a) Uniform density

(b) Temperature gradient

(c) Density gradient

(d) Uniform temperature

This question was addressed to me in my homework.

This intriguing question comes from Absorption and Emission topic in chapter Kinetic Theory of Gases of Engineering Physics I

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Correct choice is (b) Temperature gradient

The explanation: As heat flows from higher temperature to lower temperature, so a temperature gradient is required.

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