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Waves

Electromagnetic Waves - Infra-red.

Infra-red waves (often called infra-red radiation)
are easily absorbed by materials.
The energy of the wave causes the material to get hot.
We usually think of infra-red radiation as heat.

Ordinary ovens, grills and toasters use infra-red radiation to cook food
(ovens may also cook by convection).

Infra-red waves can transmit information through the air
to operate TV's and VCR's by remote control.
Information can also be sent through optical fibres.

Intense infra-red radiation will damage or kill living cells
(such as skin cells) by burning them.

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Copyright © 2007 Dr. Colin France. All Rights Reserved.