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Electromagnetic waves-from slideshare
Electromagnetic waves-from slideshare
Electromagnetic waves-from slideshare
Electromagnetic waves-from slideshare
Electromagnetic waves-from slideshare
Electromagnetic waves-from slideshare
Electromagnetic waves-from slideshare
Electromagnetic waves-from slideshare
Electromagnetic waves-from slideshare
Electromagnetic waves-from slideshare
Electromagnetic waves-from slideshare
Electromagnetic waves-from slideshare
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Electromagnetic waves-from slideshare

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Transcript

  • 1. ELECTROMAGNETIC WAVES SECONDARY 3 PHYSICS
  • 2. WHAT ARE EM WAVES?
    • Electromagnetic waves (EM waves for short) are waves that can travel in a vacuum.
    • These waves are created by the vibration of an electric charge.
  • 3. Electromagnetic Spectrum
    • It is a group of different electromagnetic waves.
    • There are 7 components in the spectrum.
  • 4. Electromagnetic Spectrum
    • Gamma rays
    • X – rays
    • Ultraviolet
    • Visible light
    • Infra-red
    • Microwaves
    • Radio waves
    Highest frequency Shortest wavelength Lowest frequency Longest wavelength
  • 5. Uses of Gamma Rays
    • Kill cancer cells
    • Study the nucleus in atoms
  • 6. Uses of X-rays
    • Take ‘pictures’ of bones in the body
    • Study the crystal structure of crystalline substances
    • Check for cracks in metal plates
  • 7. Uses of Ultraviolet
    • Detect counterfeit notes
    • Gives the clothes a ‘glow’ effect in discotheques
    • Sun-tanning
    • Sterilise medical equipment
  • 8. Uses of Visible Light
    • Enable us to see things
    • Photosynthesis in plants
  • 9. Uses of Infra-red
    • Heating
    • Haze photography
  • 10. Uses of Microwaves
    • Radar communication
    • Analysis of the molecular and atomic structure
    • Telephone communications
  • 11. Uses of Radio Waves
    • Radar communications
    • TV and radio broadcasting
  • 12. Common Properties of EM Waves
    • All transverse waves
    • All travel at the speed of light. (3 x 10 8 m/s)
    • Can travel through solid, liquid, gas and vacuum
    • Obey the laws of reflection and refraction
    • All can be absorbed and emitted by matter
    • The wave equation is applicable to all

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