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Question

Smoke rising from chimneys is example of

A
Thermionic radiation
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B
Heating of molecules in a substance
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C
Motion of molecules in a substance
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D
Heat radiation
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Solution

The correct option is A Motion of molecules in a substance
Due to diffusion, smoke molecules leave the chimney and spreads in the atmosphere.Overall a diffusion process is seen in it as smoke particles diffuse into air particles.

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