A spherical body of emissivity e = 0.6 placed | vedclass

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(D) According to the Stefan-Boltzmann law,the energy radiated by a body is given by $E = e \sigma A T^4$. However,when a body is placed inside a perfe

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$E = 1.0 \sigma A T^4$

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(D) According to the Stefan-Boltzmann law,the energy radiated by a body is given by $E = e \sigma A T^4$. However,when a body is placed inside a perfect black body cavity (or enclosure) maintained at the same temperature,the net energy exchange is governed by the absorption properties. If the body is in thermal equilibrium inside a black body enclosure,it acts as a black body itself because the radiation incident on it from the surroundings is fully absorbed and re-emitted. For a perfect black body,the emissivity $e = 1$. Therefore,the energy radiated per second by the body in this specific condition is $E = 1.0 \sigma A T^4$.

$A$ spherical body of emissivity $e = 0.6$ placed inside a perfect black body is maintained at temperature $T$. The energy radiated per second by the body will be:

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