A plane electro magnetic wave travels in vaccum along z- direction . What can you say about the direction of its electric and magnetic field vectors ? If the frequency of the wave is $30\;MHz$ What is its wave length ?

Question

$\begin{array}{1 1} (i)along\;x-y\;direction (ii)\lambda = 10\;m \\(i)along\;x-y\;direction (ii)\lambda = 100\;m \\ (i)along\;x-y\;direction (ii)\lambda = 10\;m \\ (i)along\;y-z\;direction (ii)\lambda = 100\;m\end{array}$