(a) infrared frequency
It is known as the Electromagnetic radiation (EMR) with wavelengths longer than those of Visible Light Infrared.
Infrared Frequency is a portion of the Electromagnetic Spectrum that extends from the Long-wavelength, or Red color, end of the Visible Light Range to the Microwave Range.
it can be detected as a Sensation of Warmth on the skin and Invisible to the eye.
The Infrared Frequency range is usually divided into Three Regions they are:
The Near-Infrared Frequency (nearest the visible spectrum), with Wavelengths of 0.78 to about 2.5 micrometers.
The Middle Infrared Frequency, with Wavelengths of 2.5 to about 50 micrometres.
The far Infrared Frequency, with Wavelengths of 50 to 1,000 micrometres.
Image of Electromagnetic Spectrum:
