Physics - EM Waves Question with Solution | TestHub

A plane electromagnetic wave, has frequency of$2.0\times {10}^{10} \mathrm{Hz}$and its energy density is$1.02\times {10}^{-8} \mathrm{J} {\mathrm{m}}^{-3}$in vacuum. The amplitude of the magnetic field of the wave is close to$\left(\frac{1}{4{\mathrm{\pi \epsilon }}_0}=9\times {10}^9\frac{{\mathrm{Nm}}^2}{{\mathrm{C}}^2}\right)$and speed of light$=3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}$.