EM Waves and their uses

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  • Radio waves are used for communication, because they can reflect and refract effectively. Radio waves have a wavelength longer than approximately 10 centimetres. 
  • Microwaves are used for satellite communication and mobile phones. However, you need to use microwaves which can pass easily through the Earths watery atmosphere, as radio waves can't do this. 
  • For satellite TV, the signal from a transmitter is transmitted into space where it's picked up by the satellite's receiver dish, which is orbiting the Earth. 
  • The satellite transmits the signal back to Earth in a different direction (it's refracted) where it's received by a satellite dish on the ground. 
  • Infrared…


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