A) \[8\times {{10}^{-6}}\,W/{{m}^{2}}\]
B) \[2\times {{10}^{-4}}\,W/{{m}^{2}}\]
C) \[1\times {{10}^{-4}}\,W/{{m}^{2}}\]
D) \[4\,W/{{m}^{2}}\]
Correct Answer: A
Solution :
Intensity = \[\frac{\text{Power}}{\text{Area}}=\frac{4}{4\pi \times {{(200)}^{2}}}=7.9\times {{10}^{-6}}\]\[W/{{m}^{2}}\]
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