A) \[W\,{{m}^{-2}}\,{{K}^{-1}}\].
B) \[W\,{{m}^{2}}\,{{K}^{-4}}\]
C) \[W\,{{m}^{-2}}\,{{K}^{-4}}\]
D) \[W\,{{m}^{-2}}\,{{K}^{4}}\]
Correct Answer: C
Solution :
Stefan's law is \[E=\sigma ({{T}^{4}})\]Þ \[\sigma =\frac{E}{{{T}^{4}}}\] where,\[E=\] \[\frac{\text{Energy}}{\text{Area}\times \text{Time}}\] \[=\frac{\text{Watt}}{{{m}^{\text{2}}}}\] \[\sigma =\frac{\text{Watt-}{{m}^{-2}}}{{{K}^{4}}}=Watt-{{m}^{-2}}{{K}^{-4}}\]
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