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2. Infrared radiation

  • in airport sercurity
  • in security systems such as burglar alarms
  • in fluorescent lamps
  • to broadcast radio and TV programmes

3. Radio waves are used to

  • communicate with ships, aeroplanes and satelites
  • short-range communications
  • to detect security marks using special pens
  • to look inside objects

4. Microwaves

  • in remote controls
  • to sterilise food and medical equipment
  • in mobile phones, and to communicate with satelites
  • to disinfect water

5. Gamma rays

  • to make thermal images
  • to communicate with ships
  • to detect cancer
  • in remote controls for TVs


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