Infrared rays
Infrared rays are that portion of the electromagnetic spectrum usually sensed as heat. Infrared wavelengths are longer than those of visible light, extending into the microwave frequencies. Its wavelengths vary from about 0.7 to 1,000 micrometres. Most of the radiation emitted by a moderately heated surface is infrared, and it forms a continuous spectrum. Molecular excitation produces extensive infrared radiation but in a discrete spectrum of lines or bands. Infrared wavelengths are useful for night-vision equipment, heat-seeking missiles, molecular spectroscopy, and infrared astronomy, among other things. They are used therapeutically as heat, and also to warm food in restaurants. The trapping of infrared radiation by atmospheric gases is also the basis of the greenhouse effect.
[edit] Uses of Infra-red rays
- the most common is to operate remote controls for T.V
- Doctors use infrared lamps to treat skin diseases and relieve the pain of sore muscles.
- to monitor weather patterns and ocean temperatures
- For taking pictures from camera
- Burglar alarms also use infrared.
- to study vegetation patterns and the distribution of rocks, minerals and soils
- in telescopes to study stars
- for industrial purposes also.
