Question

Define infrared radiation and give some examples of It.

Answer 1

Infrared radiations:

1. Infrared radiations can be defined as electromagnetic radiations whose wavelengths fall under the infrared region.
2. The wavelengths of infrared waves range from 700 nanometres to one millimeter.
3. Therefore, it can be understood that an infrared wave has a longer wavelength than that of visible light (and also an ultraviolet wave).
4. The frequency of infrared radiation is lower than that of visible light and higher than microwaves.
5. The frequency of infrared radiations ranges from 300 gigahertz to about 400 terahertz.

Common examples of infrared waves include:

1. Long-wave infrared radiation (often abbreviated to LWIR) and short-wave infrared radiation (often abbreviated to SWIR).
2. Common television remotes emit signals in the form of short-wave infrared radiation.
3. The heat that emanates from fires and lit charcoal is transmitted via long-wave infrared radiation.