Electromagnetic Waves

HideShow resource information
  • Created by: adelaide
  • Created on: 13-01-13 10:03
View mindmap
  • Electromagnetic Waves
    • the electromgnetic spectrum
      • Wave Speed= frequency x wavelength
        • v=f x ?
      • Electromagnetic waves are electric and  magnetic disturbances that transfer energy from one place to another
    • Light, Infrared, microwaves and radio waves
      • white light contains all the colours in the spectrum
      • Infrared Radiation
        • absorbed by skin, damages cells
        • The hotter an object= more infrared radiation
        • optical fibres, remote control handsets, scanners and infrared cameras
      • Microwaves
      • Radiowaves
        • Have a longer wavelength but smaller frequency
        • carry radio, tv and mobile phone signals
        • bluetooth and wireless networks use radio waves
    • Communications
      • radiowaves of different frequencies are used for different purposes
        • affects: how far they can go. how much the can spread. how much info they carry
    • The expanding Universe
      • The red-shift of a distant galaxy is moving away from us
        • The faster a distant galaxy is moving away from us, the < the redshift
      • all distant galaxies show a red shift
      • All galaxies are moving away from us= universe expanding
      • RED SHIFT= increase in wavelength of em waves emitted by a star
      • BLUE-SHIFT= decrease in the wavelength of em waves emitted by a star
    • The Big Bang Theory
      • Universe has been expanding ever since
      • Cosmic microwave background radiation can only be explained by The Big Bang Theory
      • CMBR created as high gamma radiationits now microwave radiation
  • Radio, Micro, Infrared, Light, Ultraviolet, X-rays, Gamma
    • the electromgnetic spectrum
      • Wave Speed= frequency x wavelength
        • v=f x ?
      • Electromagnetic waves are electric and  magnetic disturbances that transfer energy from one place to another
    • Radio waves have the biggest wavelength,
    • Gamma radiation have the smallest wavelength
  • The hotter an object= more infrared radiation

Comments

No comments have yet been made

Similar Physics resources:

See all Physics resources »See all Electromagnetic Spectrum resources »