Question

Find the amplitude of the electric field in parallel beam of light of intensity 8 Wm-2

Answer 1

Dear Student,

$$\begin{gathered} {\mathrm{E}}_0=\sqrt{\frac{2\mathrm{I}}{{\mathrm{\epsilon }}_0\mathrm{c}}} \\ {\mathrm{E}}_0=\sqrt{\frac{2\times 8}{8.85\times {10}^{-12}\times 3\times {10}^8}} \\ {\mathrm{E}}_0=77.62\mathrm{N}/\mathrm{C} \end{gathered}$$