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What does Stefan-Boltzmann law for radiation pyrometers denote?

What does Stefan-Boltzmann law for radiation pyrometers denote? Correct Answer W = KT4

The principle of radiation pyrometer is based on a standard radiation body known as a blackbody. By Stefan-Boltzmann law, W = KT4 expresses the rate of radiation energy as a proportional to the fourth power of absolute temperature. Here W is the rate of energy emitted and K is a constant of proportionality.

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