Ch 18 1 electromagnetic waves

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Ch 18 1 electromagnetic waves

  1. 1. Ch 18-1 Electromagnetic Waves
  2. 2. Electromagnetic Waves <ul><li>They are transverse waves consisting of changing electric and magnetic fields. </li></ul><ul><li>Often similar but they are different from mechanical waves </li></ul><ul><li>They are produced when an electric charge vibrates or accelerates. </li></ul><ul><li>They can travel through matter or empty space. </li></ul><ul><li>Electromagnetic radiation is the transfer of energy by electromagnetic waves through space or matter. </li></ul>
  3. 3. Speed of Electromagnetic Waves <ul><li>Albert Michelson measured the speed of light </li></ul><ul><li>In a vacuum the speed of light is </li></ul><ul><li>c = 3.0 x 10 8 m/s </li></ul><ul><li>All electromagnetic waves travel at this speed in a vacuum. </li></ul><ul><li>Electromagnetic waves vary in wavelength and frequency – If wavelength increases then frequency decreases. </li></ul>
  4. 4. Wave or Particle <ul><li>Electromagnetic radiation behaves sometimes like a wave and sometimes like a stream of particles. </li></ul><ul><li>The intensity is the rate at which a wave’s energy flows through a given area </li></ul><ul><li>The intensity of light decreases as photons travel farther from the source. </li></ul>

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