A) \[1.5\times {{10}^{13}}\,W/{{m}^{2}}\]
B) \[2.5\times {{10}^{9}}\,W/{{m}^{2}}\]
C) \[3.5\times {{10}^{17}}\,W/{{m}^{2}}\]
D) None of these
Correct Answer: B
Solution :
Area through which the energy of beam passes \[=\,(6.328\times {{10}^{-7}})=4\times {{10}^{-13}}{{m}^{2}}\] \ \[I=\frac{P}{A}=\frac{{{10}^{-3}}}{4\times {{10}^{-13}}}=2.5\times {{10}^{9}}\,W/{{m}^{2}}\]
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