A) \[\text{W}{{\text{m}}^{\text{-2}}}{{\text{K}}^{\text{-1}}}\]
B) \[\text{Wm }{{\text{K}}^{\text{-4}}}\]
C) \[\text{W}{{\text{m}}^{\text{-2}}}{{\text{K}}^{\text{-4}}}\]
D) \[\text{M}{{\text{m}}^{\text{-2}}}{{\text{K}}^{\text{-4}}}\]
Correct Answer: C
Solution :
According to Stefans law, the energy radiated per second or power radiated is given by \[P=\sigma A{{T}^{4}}\] \[\therefore \] \[\sigma \frac{P}{A{{T}^{4}}}\] Therefore, unit of \[\sigma =\frac{W}{{{m}^{2}}{{K}^{4}}}=W{{m}^{-2}}{{K}^{-4}}\]
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