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  4. The amount of radiation emitted by a perfectly black body is proportional to

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Q. The amount of radiation emitted by a perfectly black body is proportional to

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Solution:

According to the Stefan’s law the radiant energy emitted by a perfectly black body per unit area per second is directly proportional to the fourth power of its absolute temperature
$R \propto T^{4}$
or $R=\sigma\,T^{4}$
where $\sigma$ is a Stefan’s constant