A) 64.7 V/m
B) 57.8 V/m
C) 56.72 V/m
D) 54.77 V/m
Correct Answer: D
Solution :
Intensity of EM wave is given by \[I=\frac{P}{4\pi {{R}^{2}}}={{v}_{av}}.c=\frac{1}{2}{{\varepsilon }_{0}}E_{0}^{2}\times c\] Þ \[{{E}_{0}}=\sqrt{\frac{P}{2\pi {{R}^{2}}{{\varepsilon }_{0}}c}}\] \[=\sqrt{\frac{800}{2\times 3.14\times {{(4)}^{2}}\times 8.85\times {{10}^{-12}}\times 3\times {{10}^{8}}}}\] = 54.77 \[\frac{V}{m}\]
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