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A plane wave propagating through a medium $\left[\varepsilon_{\mathrm{r}}=8, v_{\mathrm{r}}=2\right.$, and $\left.\sigma=0\right]$ has its electric field given by $\overrightarrow{\mathrm{E}}=0.5 \hat{\mathrm{X}} \mathrm{e}^{-(z / 3)} \sin \left(10^{8} t-\beta z\right) \mathrm{V} / \mathrm{m}$. The wave impedance, in ohms is

  1. $377$
  2. $198.5 \angle 180^{\circ}$
  3. $182.9 \angle 14^{\circ}$
  4. $133.3$

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