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A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the directions of its electric and magnetic field vectors? If the frequency of the wave is $30 \mathrm{MHz}$, what is its wavelength?
Solution:
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Verified Answer
Here $\vec{E}$ and $\vec{B}$ are mutually perpendicular in $X-Z$ and Y-Zplanes.
$$
\because \quad \mathrm{c}=v \lambda \Rightarrow \lambda=\frac{\mathrm{c}}{v}=\frac{3 \times 10^8}{30 \times 10^6}=10 \mathrm{~m}
$$
$$
\because \quad \mathrm{c}=v \lambda \Rightarrow \lambda=\frac{\mathrm{c}}{v}=\frac{3 \times 10^8}{30 \times 10^6}=10 \mathrm{~m}
$$
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