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Unit of Stefan's constant is:
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The correct answer is:
$\mathrm{Wm}^{-2} \mathrm{~K}^{-4}$
Stefan's law is \(E=\sigma\left(T^4\right)\)
\(\begin{aligned}
& \Rightarrow \sigma=\frac{E}{T^4} \\
& \text {where, } E=\frac{\text { Energy }}{\text { Area } \times \text { Time }}=\frac{\text { Watt }}{m^2} \\
& \sigma=\frac{\text { Watt }-m^2}{k^4}=\text { Watt }-m^{-2} k^{-4}
\end{aligned}\)
\(\begin{aligned}
& \Rightarrow \sigma=\frac{E}{T^4} \\
& \text {where, } E=\frac{\text { Energy }}{\text { Area } \times \text { Time }}=\frac{\text { Watt }}{m^2} \\
& \sigma=\frac{\text { Watt }-m^2}{k^4}=\text { Watt }-m^{-2} k^{-4}
\end{aligned}\)
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