GCSE Physics (AQA)

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Radio Wave Signals

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Waves Electromagnetic waves

Radio Wave Signals

4:07 Radio Waves and Hazardous Waves
Spec 4.6.2.3
Previous Applications of Gamma & X-Rays Next Hazards from EM Waves
  • Radio waves are used to send signals between aerials.
  • The process involves alternating current causing electrons to move in the transmitting aerial.
  • Alternating current (AC) transfers electrical energy by moving delocalized electrons in a conductor.
  • The oscillation of electrons produces an electromagnetic wave of the same frequency.
  • Electromagnetic waves are transverse waves that travel as oscillations between electric and magnetic fields.
  • The frequency of the electromagnetic wave matches the frequency of the current.
  • Radio waves are produced because they have the lowest frequency among electromagnetic waves.
  • The electromagnetic wave travels to a receiving aerial, which should be aligned with the transmitting aerial.
  • The wave transfers energy from the transmitting aerial to the receiving aerial.
  • The wave causes electrons in the receiving aerial to oscillate with the same frequency.
  • This oscillation produces an alternating current in the receiving aerial, carrying energy and information.
  • The frequency of the receiving current is determined by the frequency of the wave.
  • Signals are sent by varying frequencies and amplitudes in the waves.
  • Computers and speakers can translate these signals into messages.

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