The electric field and magnetic field components of an electromagnetic wave going through vacuum is described by

$\begin{array}{r}{\mathrm{E}}_{\mathrm{x}}={\mathrm{E}}_0\sin (\mathrm{kz}-\mathrm{\omega t})\\ {\mathrm{B}}_{\mathrm{y}}={\mathrm{B}}_0\sin (\mathrm{kz}-\mathrm{\omega t})\end{array}$

Then the correct relation between ${\mathrm{E}}_0$ and ${\mathrm{B}}_0$ is given by