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A plane polarized monochromaticEM wave is traveling in vacuum along zdirection such that at t=t1 it is found thatthe electric field is zero

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I think question is incomplete.

If it is

A plane polarized monochromatic EM wave is traveling in vacuum along z direction such that at t=t_{1} it is found that the electric field is zero at a spatial point z_{1}. The next zero that occurs in its neighbourhood is at z_{2}. The frequency of the electromagnetic wave is :

then answer is

 Wavelength=2(z_{2}-z_{1})

\therefore frequency = \frac{c}{\lambda }=\frac{3*10^{8}}{2\left |z_{2}-z_{1} \right |}

                                         =\frac{1.5*10^{8}}{\left | z_{2}-z_{1} \right |}

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Safeer PP

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