A plane electromagnetic wave travels in vacuu | vedclass

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(A) The electromagnetic wave travels in a vacuum along the $z$-direction. The electric field vector $\vec{E}$ and the magnetic field vector $\vec{B}$

Vedclass · Accepted Answer

$10$

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(A) The electromagnetic wave travels in a vacuum along the $z$-direction. The electric field vector $\vec{E}$ and the magnetic field vector $\vec{B}$ are in the $x-y$ plane and are mutually perpendicular to each other and to the direction of propagation ($z$-direction).Given frequency of the wave,$
u = 30 \; MHz = 30 	imes 10^{6} \; s^{-1}$.Speed of light in a vacuum,$c = 3 	imes 10^{8} \; m/s$.The wavelength $\lambda$ is given by the formula $\lambda = \frac{c}{
u}$.Substituting the values: $\lambda = \frac{3 	imes 10^{8}}{30 	imes 10^{6}} = \frac{300 	imes 10^{6}}{30 	imes 10^{6}} = 10 \; m$.

$A$ plane electromagnetic wave travels in vacuum along the $z$-direction. What can you say about the directions of its electric and magnetic field vectors? If the frequency of the wave is $30 \; MHz$,what is its wavelength in $m$?

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