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  4. The amount of energy radiated by a body per unit time depends upon :

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Q. The amount of energy radiated by a body per unit time depends upon :

Thermal Properties of Matter

Solution:

Total radiation power from a body is given as $P=\sigma e A T^{4}$ where $e$ is emissivity of the body surface, $A$ is the surface area and $T$ is its absolute temperature.