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

Explanation

Since, electromagnetic waves are transverse in nature. The electric and magnetic fields are mutually perpendicular as well as perpendicular to the direction of propagation of the wave, therefore `vec(E ) and vec(B)` are in XY plane. We are given: `v= 30 MHz= 30 xx 10^(6)Hz`
`therefore lamda= (c )/(v)= (3 xx 10^(8))/(30 xx 10^(8))= 10m`