The electric field in an electromagnetic wave is given by $E = 56.5 \sin \omega(t - x/c) \; NC^{-1}$. Find the intensity of the wave if it is propagating along the $x$-axis in free space. (Given $\varepsilon_{0} = 8.85 \times 10^{-12} \; C^{2} N^{-1} m^{-2}$ and $c = 3 \times 10^{8} \; m/s$)
- A$5.65 \; W m^{-2}$
- B$4.24 \; W m^{-2}$
- C$1.9 \times 10^{-7} \; W m^{-2}$
- D$56.5 \; W m^{-2}$
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