GCSE Combined Science (AQA)

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Properties of Low-Frequency EM Waves

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Waves Electromagnetic waves

Properties of Low-Frequency EM Waves

5:23 Applications of Electromagnetic Waves
Spec 4.6.2.4
Previous Applications of Low-Frequency EM Waves Next Properties of High-Frequency EM Waves
  • Electromagnetic waves are used in various ways in everyday life.
  • Low frequency electromagnetic waves include infrared (IR) waves, microwaves, and radio waves.
  • These waves have long wavelengths and low frequencies, are not visible to the human eye, and pose no risk to health.
  • Radio waves are good for sending signals as they can travel long distances through air and are not much affected by air.
  • Radio waves are often used to send TV and radio signals from an antenna to homes and businesses.
  • Radio waves can be reflected off the upper atmosphere to move around the earth.
  • Microwaves can transmit through the atmosphere and into space, making them suitable for satellite signals.
  • Microwaves are absorbed by water molecules in food, making them useful for cooking in microwave ovens.
  • Infrared light is absorbed by most chemical bonds, increasing internal energy and heating objects.
  • Infrared waves are used for conventional ovens and electric heaters.
  • Objects release thermal energy as infrared light, which can be detected to create thermal images.
  • Ovens and heaters heat metals to release infrared waves.
  • Understanding basic properties of electromagnetic waves helps in choosing the right type for specific applications.

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