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Q. The electric field in an electromagnetic wave is given by:
$E=\left(50 N C ^{-1}\right) \sin \omega\left(t-\frac{x}{c}\right)$
Find the intensity (in $W / m ^{2}$ ) of the wave.

Electromagnetic Waves

Solution:

$I=\frac{1}{2} \varepsilon_{0} E_{0}^{2} c=3.3\, W / m ^{2}$