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

Explanation

In e.m. wave the elctric and magnetic field vectors `vecE` and magnetic field vector `vecB` show their variations
perpendicular to the direction of propagation of wave as well as perpendicular to each other. As the
electromagnetic wave is travelling along Z-direction, hence `vecE and vecB` show their variation is x-y plane.
Wavelength, `lambda=c/v=(3xx10^8m//s)/(30xx10^6s^-1)=10m`