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