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Infra red waves are just below visible red light in the electromagnetic spectrum ("Infra" means "below").

You probably think of Infra-red waves as heat, because they're given off by hot objects, and you can feel them as warmth on your skin.

Infra Red waves are also given off by stars, lamps, flames and anything else that's warm - including you.

The detector on this security light picks up the Infra red radiation from your body.

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The danger to people from too much Infra-Red radiation is very simple - overheating. Is  danger cause it get really hot so it can cause fire.

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They are used for many tasks, for example, remote controls for TVs and video recorders, and physiotherapists use heat lamps to help heal sports injuries. IR is also used for short-range communications, for example between mobile phones, or for the Dolby Screentalk headset system used in some cinemas.

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Electromagnetic radiation can be expressed in terms of energy, wavelength, or frequency. Frequency is measured in cycles per second, or Hertz