In a plane E.M wave, the maximum value of an electric field component is 4.4 v/m. The intensity of the wave is nearly

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$25.7 m W / m^{2}$

$22.4 m W / m^{2}$

$4.5 m W / m^{2}$

$65.5 m W / m^{2}$

answer is B.

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Detailed Solution

$I = \frac{1}{2} \in_{0} {E_{0}}^{2} \times c = \frac{1}{2} \times 8.85 \times 10^{- 12} \times 4.4 \times 4.4 \times 3 \times 10^{8} = 25.7 \times 10^{- 3} N / m^{2}$

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