The Electromagnetic Spectrum. Electromagnetic radiation is a disturbance in an electric field. This results in a magnetic field at right angles to the electric one. Therefore it is called an electromagnetic radiation – electric and magnetic disturbances result!.
The waves cover a continuous range of wavelengths called the electromagnetic spectrum.They are called different names according to how they are produced and have a wide range of wavelengths
wave speed (metre/second, m/s) = frequency (hertz, Hz) × wavelength (metre, m)
wavespeed = fl
c = fl