Electromagnetic waves
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Electromagnetic waves

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Electromagnetic waves Presentation Transcript

  • 1. Science Starter: February 27, 2012
    • You will turn this in for a grade.
    • Write a paragraph (at least 5 sentences) that starts with “Science is…..”
  • 2. Electromagnetic Waves have unique traits
  • 3. What is an Electromagnetic Wave
    • http://www.classzone.com/books/ml_science_share/vis_sim/wslm05_pg74_emwave/wslm05_pg74_emwave.html
  • 4. Electromagnetic Waves
    • Electromagnetic Wave- a disturbance that transfers energy through a field
      • Also called EM waves
  • 5. Facts about EM Waves
    • Most EM waves are invisible, but can be perceived (examples: light and heat)
  • 6. How EM Waves Form
    • EM waves are made up of two transverse waves- one electrical, one magnetic
    • Both electrical and magnetic fields MUST be present for an EM wave to form
  • 7. Sources of EM Waves
    • Most of the EM waves in Earth’s environment come from the Sun.
    • Technology is also a source of EM waves
  • 8. Transfer of Energy
    • Radiation - the transfer of energy in the form of EM waves
    • EM waves DO NOT require a medium to travel through
      • EM waves CAN travel in a vacuum
  • 9. Speed of EM Waves in a Vacuum
    • In a vacuum, EM waves travel at a constant speed – 186,000 mi/s
    • In one second an EM wave can travel more than 7 times around the Earth
    • The constant speed is known as the speed of light
  • 10. Transferring Energy
    • How does a microwaves oven work?
    http:// www.youtube.com/watch?v =FGdwEPEU61U