The electric field in an electromagnetic wave is given by $\mathrm{E} = 56.5 \sin \mathrm{\omega }(\mathrm{t} - \raisebox{1ex}{$\mathrm{x}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{c}$}\right.) {\mathrm{NC}}^{-1}$. Find the intensity of the wave if it is propagating along x-axis in the free space. (Given ${\mathrm{\epsilon }}_0 = 8.85 \mathrm{x} {10}^{-12} {\mathrm{C}}^2 {\mathrm{N}}^{-1} {\mathrm{m}}^{-2})$