Electromagnetic spectrum is the range of light rays of multiple frequencies and wavelengths. Only light rays that fall between certain frequency and wavelength is visible to human eyes, rest are not. The ones that are not visible include low frequency waves, radio waves, microwaves, infrared waves, ultraviolet rays, X-rays, gamma rays. These are also types of electromagnetic radiation. Let’s have a look at different regions in this spectrum.
Radio waves are waves that are emitted by the radio stations, stars and gases in space. Their wavelengths ranges from hundreds of meters to about one millimeter. The purpose of these waves is translation of data (like songs from radio station to users) by the process of modulation and demodulation. Any radio station operates in a range of particular frequency that has been allocated to it by the government.
These are on the short sides of the radio waves. They are short and are measured in millimeters. They are produced with klystron and magnetron tubes. They are used in microwave ovens to cook/warm food, by astronomers and scientists to study the structure of nearby galaxies.
They are further classified into three types. Far, mid and near.
- Far-infrared – The frequencies of these waves ranges from 300 GHz to 30 THz and wavelength from 1 mm – 10 ?m.
- Mid-infrared – The frequencies of these waves ranges from 30 THz to 120 THz and wavelength from 10 ?m – 2.5 ?m.
- Near-infrared – The frequencies of these waves ranges from 120 THz to 400 THz and wavelength from 2500 nm – 750 nm.
VISIBLE LIGHT WAVES
These are waves that are visible to human eyes. They have frequency from 400 THz to 790 THz and wavelength from 380 nm and 760 nm.
The wavelength of UV rays is shorter than the violet end of the visible spectrum but longer than the X-ray. It has the tendency to ionize atoms and thus completely change their behaviors. The major source of emission of these waves is sun.
They are extremely used for medical purposes to see the inner side of human structures and detect diseases. They have wavelength in ranges from 10-8 to 10-11 meters.
They have wavelength in ranges starting from 10-11 meters. They are used for radiography purposes.