Four properties of electromagnetic waves

Electromagnetic (EM) properties, such as electrical conductivity, dielectric permittivity, and magnetic permeability , are dispersive in nature, such that the EM properties are functions of the operating frequency of the externally applied EM field.

The electromagnetic spectrum is generally divided into seven regions, in order of decreasing wavelength and increasing energy and frequency . The common designations are radio waves, microwaves, infrared (IR), visible light, ultraviolet (UV) light, X-rays and gamma-rays.

Physical Science 2) Electromagnetic waves travel with a constant velocity of 3 x 108 ms-1 in vacuum . 3) Electromagnetic waves are not deflected by electric or magnetic field. 4) Electromagnetic waves can show interference or diffraction. 5) Electromagnetic waves are transverse waves.

Electromagnetic waves are typically described by any of the following three physical properties: frequency (f), wavelength (λ), or intensity (I) . Light quanta are typically described by frequency (f), wavelength (λ), or photon energy (E).