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Lets say if I have a body at temperature T and the surroundings temperature is t (t>T). Does the body radiate heat to the surroundings or it just absorbs heat?

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It does both. It radiates heat to the surroundings and the surroundings radiate to it. Each of these effects will be proportional to the temperature to the fourth power: $P_{emitted}\propto T_{object}^4$ and $P_{received}\propto T_{environment}$. As such, the net radiative losses or gains are proportional to $T_{object}^4 - T_{environment}^4$

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  • $\begingroup$ Did you loose a ^4? $\endgroup$ Nov 18, 2020 at 16:18

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