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The electric field part of an electromagnetic wave in a medium is represented by \( E_{x}=0 \)
\[
E_{y}=2.5 \frac{N}{C} \cos \left[\left(2 \pi \times 10^{6} \frac{\mathrm{rad}}{\mathrm{s}}\right) t-\left(\pi \times 10^{-2} \frac{\mathrm{rad}}{\mathrm{m}}\right) x\right]
\]
\( E_{z}=0 \). The wave is
(a) Moving along \( y \) direction with frequency \( 2 \pi \times 10^{6} \mathrm{~Hz} \) and wavelength \( 200 \mathrm{~m} \).
(b) Moving along \( x \)-direction with frequency \( 10^{6} \mathrm{~Hz} \) and wavelength \( 100 \mathrm{~m} \).
(c) Moving along \( x \)-direction with frequency \( 10^{6} \mathrm{~Hz} \) and wavelength \( 200 \mathrm{~m} \).
(d) Moving along \( -x \) direction with frequency \( 10^{6} \mathrm{~Hz} \) and wavelength \( 200 \mathrm{~m} \).
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