GCSE Combined Science (AQA)

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Electromagnetic Waves

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Waves Electromagnetic waves

Electromagnetic Waves

3:41 Introduction to Electromagnetic Waves
Spec 4.6.2.1
Previous Water Ripples Next Electromagnetic Spectrum
  • Electromagnetic waves can transfer energy without traveling through matter.
  • Key property distinguishing electromagnetic waves from mechanical waves.
  • Electromagnetic waves can travel through a vacuum, demonstrated by the sun's energy reaching Earth.
  • The sun emits multiple types of waves providing light and heat to Earth.
  • Electromagnetic waves are transverse waves with oscillations perpendicular to the wave's direction.
  • Examples of devices emitting electromagnetic waves: satellite dish (microwaves), sunbed lamp (ultraviolet waves), torch (visible light).
  • All electromagnetic waves travel at the same speed in a vacuum.
  • Speed of a wave calculated by multiplying wavelength by frequency (V = ��F).
  • Different electromagnetic waves have different frequencies and wavelengths but the same speed.
  • Speed of electromagnetic waves in a vacuum is 3 x 10^8 meters per second, known as the speed of light.
  • This speed applies to all types of electromagnetic waves.

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