Physics - EM Waves Question with Solution | TestHub

$\overrightarrow{\mathrm{S}}=\frac{\overrightarrow{\mathrm{E}}\times \overrightarrow{\mathrm{B}}}{{\mu }_0}$ is called the Poynting vector after its discoverer, John Poynting. The average magnitude of $\overrightarrow{\mathrm{S}}$ is the intensity of the wave, and the direction of $\overrightarrow{\mathrm{S}}$ is the direction of propagation of the wave.