During the propagation of electromagnetic waves in a medium

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Q:13

During the propagation of electromagnetic waves in a medium

Electric energy density is half of the magnetic energy density.

Electric energy density is equal to the magnetic energy density.

Both electric and magnetic energy densities are zero.

Electric energy density is double of the magnetic energy density.

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The electric field of an electromagnetic wave in free space is given by $\overrightarrow{E} = 10cos(10^7t +kx)\hat{j} \;V/m$ where t and $x$ are in seconds and metres respectively. It can be inferred that
(a) The wavelength λ is 188.4 m
(b) The wave number k is 0.33 rad/m
(c) The wave amplitude is 10 V/m
(d) The wave is propagating along +$x$ direction
Which one of the following pairs of statements is correct?

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