Characteristics of electromagnetic radiations:
Wavelength: It may be defined as the distance between two neighbouring crests or troughs of wave as shown. It is denoted by λ.
Frequency (ν): It may be defined as the number of waves which pass through a particular point in one second.
Velocity (v): It is defined as the distance travelled by a wave in one second. In vacuum all types of electromagnetic radiations travel with the same velocity. Its value is 3 x 108 m sec-1. It is denoted by v
Period : Total time taken by wave to travel 1 wavelength 'T'
Velocity = frequency x wavelength c = νλ
