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Electromagnetic Waves


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Electromagnetic Waves

  1. 1. Waves Ms. Shinkle 11/2-5, 2007
  2. 2. Types of Waves <ul><li>Mechanical Waves </li></ul><ul><ul><li>Sound </li></ul></ul><ul><ul><li>Earthquake </li></ul></ul><ul><ul><li>Springs </li></ul></ul><ul><li>Electromagnetic </li></ul><ul><ul><li>Light </li></ul></ul><ul><ul><li>Radio </li></ul></ul><ul><ul><li>X-ray </li></ul></ul>
  3. 3. Electromagnetic Radiation <ul><li>Examples: Radio, TV, Microwave, X-Rays, Gamma Rays, Light, Ultraviolet, Infrared </li></ul><ul><li>Do NOT need a medium </li></ul><ul><ul><li>Can travel through space </li></ul></ul><ul><li>How astronomers observe the universe </li></ul>
  4. 4. How Fast? <ul><li>EMR is the fastest stuff around </li></ul><ul><li>Speed (“ c ”) is 3 × 10 8 m/s </li></ul><ul><li>All EMR travels at the same speed </li></ul><ul><li>Each type of EMR has a different wavelength and frequency </li></ul>
  5. 5. Wave Basics <ul><li>Baseline E. Positive amplitude </li></ul><ul><li>Peak F. Negative amplitude </li></ul><ul><li>Peak to peak wavelength G. Trough </li></ul><ul><li>Trough to trough wavelength </li></ul>
  6. 6. Electromagnetic Spectrum
  7. 7. How do you make EMR? <ul><li>Just like any other wave, something has to move or vibrate </li></ul><ul><li>Only now, it takes an electric charge (like an electron) that vibrates or moves </li></ul>
  8. 8. Wavicles <ul><li>EMR can act like a wave – it reflects, refracts, diffracts, etc. </li></ul><ul><li>EMR can act like a particle (Photons) </li></ul><ul><li>That’s what makes solar panels work. It’s called the Photoelectric Effect. </li></ul>
  9. 9. Visible Light in the EMR Spectrum
  10. 10.