Physics — Electromagnetic Waves
Speed of light, the field ratio and the Poynting vector.
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c = f\lambda = 3\times 10^8\ \text{m/s}
c = \frac{1}{\sqrt{\mu_0\varepsilon_0}}
\frac{E}{B} = c
\mathbf{S} = \frac{1}{\mu_0}\mathbf{E}\times\mathbf{B}