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  4. The unit of Stefan’s constant σ is

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Q. The unit of Stefan’s constant $\sigma$ is

Physical World, Units and Measurements

Solution:

Stefan’s law $E=\sigma\left(T^{4}\right)\Rightarrow \sigma=\frac{E}{T^{4}}$
$E=\frac{\text{Energy}}{\text{Area} \times \text{Time}}=\frac{\text{watt}}{m^{2}}$
$\sigma=\frac{W-m^{-2}}{K^{4}}=W-m^{-2}K^{-4}$