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Radio Waves | Physics for Grade 10 PDF Download

Introduction to Radio Waves

  • Radio waves can be produced by connecting an antenna to a high frequency alternating current (a.c.) power source
  • The oscillation of charge in the a.c. circuit produces radio waves with the same frequency of oscillation

Radio waves are produced by high-frequency alternating currents and induce similar currents when they are receivedRadio waves are produced by high-frequency alternating currents and induce similar currents when they are received

  • In the transmitting antenna:
    • The charge from the alternating current oscillates up and down the antenna
    • This produces radio waves that can be absorbed by a similar aerial some distance away
  • In a receiving aerial:
    • The metal aerial absorbs the radio waves
    • This creates an alternating current with the same frequency as the transmitted wave
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