The electromagnetic spectrum
You should know some of the properties and uses of ultraviolet radiation and infrared radiation.
Ultraviolet radiation is found naturally in sunlight. We cannot see or feel ultraviolet radiation, but our skin responds to it by turning darker. This happens in an attempt to reduce the amount of ultraviolet radiation that reaches deeper skin tissues. Darker skins absorb more ultraviolet light, so less ultraviolet radiation reaches the deeper tissues. This is important because ultraviolet radiation can cause normal cells to become cancerous.
Ultraviolet radiation is used in:
Infrared radiation is absorbed by the skin and we feel it as heat. It is used in heaters, toasters and grills. It is also used for television remote controls and in optical fibreoptical fibre: A fine glass fibre, through which light travels by total internal reflection, from one end to the other. communications.
Visit Heat transfer and efficiency for more information about infrared radiation.
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