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An enclosure’s wall is somehow maintained at constant temperature $T_{0}$ Kelvin. A body having temperature $T$ Kelvin (surface area A temperature $T_{o} K < T K,$ absorptivity is a and emissivity is e) is placed inside the enclosure ( $σ$ = Stephen constant). Choose the correct option(s).

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Power absorbed by body is $a A σ T_{o}^{4}$

The body will be absorbing energy even after its temperature has reached $T_{0} .$

At some temperature body will be only emitting energy with no absorption

For the body at all times the rate of absorption is equal to rate of emissions as $a = e$

answer is A, B.

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Detailed Solution

$P = a A σ T_{o}^{4}$ When body reaches at $T_{o}$ even then it absorbs radiation

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