P4 Physics pg 94

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  • Satellites and Radio/microwaves
    • Communication satellites stay over the same point on Earth
      • Quite a high orbit over equator
      • Stay above the same point
        • because they stay at the same point, transfer signals from one side of the Earth to the over
    • Some satellites are in low polar orbits
      • In a low polar orbit, satellites moves over both poles while the Earth rotates
      • They move faster because there is a stronger pull of gravity
      • The whole surface of the Earth can be monitored
      • Weather/Spying satellites need a low orbit
    • Microwaves are used for satellite communication
      • Signal from the transmitter is sent to space where its recieved by the dish
        • The satellite dish transmits the signal to Earth where its recieved by a dish
        • Or the signal is sent to other satellites
    • Microwaves have higher frequencies than radio waves
      • Satellite signals weaken as they travel (from interfernce or loss of intensity)
        • Digital signals are used as they're high quality
      • Microwaves pass easily through the atmosphere to satellites
  • Geostationary artificial satellites, ideal for telephone, tv, radio
    • Communication satellites stay over the same point on Earth
      • Quite a high orbit over equator
      • Stay above the same point
        • because they stay at the same point, transfer signals from one side of the Earth to the over
  • Microwaves are used for satellite communication
    • Signal from the transmitter is sent to space where its recieved by the dish
      • The satellite dish transmits the signal to Earth where its recieved by a dish
      • Or the signal is sent to other satellites

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