Physics-Electromagnetic waves

Electromagnetic waves

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Electromagnetic waves

The electromagnetic spectrum

  • The electromagnetic spectrum (in order of increasing wavelength is: gamma rays, X-rays, ultraviolet, visible, infrared microwaves, radiowaves
  • v=f x (upside down y) can be used to calculate the frequency or wavelengthof electromagnetic waves
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Electromagnetic waves

Light, infrared, microwaves and radio waves

  • White light contains all the coloura of the spectrum
  • Visible light, infrared radiation, microwaves and radio waves are all used for communucation
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Electromagnetic waves

Communications

  • Radio waves of different frequencies are used for different purposes
  • Microwaves are used for satellite TV signals
  • Research is needed to evaluate whethere or not mobile phones are safe to use
  • Optical fibres are very thin fibres that are used to transmit signals by light and infrared radiation
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Electromagnetic waves

The expanding universe

  • Light from distant galaxies is red-shift
  • Red-shift provide evidence that the universe is expanding
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Electromagnetic waves

The Big Bang

  • The universe started with the Big Bang; a massive explosion from a very small initail point
  • The universe has been expanding ever since the Big Bang
  • Cosmic microwave background radiation (CMBR) is electromagnetic radiation created just after the Big Bang
  • At present CMBR can only be explained by the Big Bang theory
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