The electric field and magnetic field components of an electromagnetic wave going through vacuum is described by
$$
\begin{aligned}
& E_x=E_0 \sin (k z-\omega t) \\
& B_y=B_0 \sin (k z-\omega t)
\end{aligned}
$$
Then the correct relation between $\mathrm{E}_0$ and $\mathrm{B}_0$ is given by
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