Radio, Microwave and Infrared

Radio waves, microwaves and infrared are lower-frequency regions of the electromagnetic spectrum compared with visible, ultraviolet, X-rays and gamma rays.

Radio waves have long wavelengths and relatively low frequencies. Common uses include: radio broadcasting; television broadcasting; * some communication systems. Their long wavelengths can allow them to diffract around large obstacles and travel over significant distances.

Microwaves have shorter wavelengths and higher frequencies than many radio waves. Applications include: satellite communication; mobile and wireless communication; radar; microwave heating. Microwaves can pass through the atmosphere effectively in useful frequency bands.

Infrared radiation is associated strongly with thermal radiation from warm objects. Applications include: thermal imaging; remote controls; heaters; night-vision systems; * temperature sensing.