Write any four characteristics of electromagnectic waves. Give two uses each of Radio-waves.

Explanation

1.Electromagnetic waves do not require any material medium for their propagation. They can propagate in vaccum as well as in a medium.
2.Speed of electromagnetic wave in a medium is given by `v=1/sqrt(muepsilon)` where `mu` and `epsilon` are respectively the permeability and permitivity of the medium.