A wave is a disturbance that travels through a medium in a periodic fashion, carrying energy without transporting matter. Waves are described and measured by five wave parameters: the period, the frequency, the amplitude, the wavelength, and the speed.

electromagnetic radiation - a kind of radiation including visible light, radio waves, gamma rays, and X-rays, in which electric and magnetic fields vary simultaneously.

wavelength - the distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.

frequency - Frequency is the number of occurrences of a repeating event per unit of time. It is also referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular frequency.

amplitude - the maximum extent of a vibration or oscillation, measured from the position of equilibrium.