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Wave Interactions

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Transcript

  • 1. Wave Interactions
    Students will be able to
    Describe reflection, refraction, and diffraction
    Explain interference and standing waves
    Identify Seismic Waves
    Find epicenter of earthquake using seismograph
    Page 17
  • 2. Reflection
    When an object hits a surface through which it can not pass, it bounces back.
    18
  • 3. Reflection
    Angle of incidence = Angle of reflection
    18
  • 4. Refraction
    Bending of waves
    When a wave enters a new medium its speed changes.
    19
  • 5. Diffraction
    When a wave moves around a barrier or through an opening, it bends and spreads out.
    20
  • 6. Interference
    What happens when two waves meet.
    Constructive = Working together
    Destructive = Subtracting from each other
    20
  • 7. Interference
    21
  • 8. Standing Waves
    If the incoming wave and the reflected way have the correct frequency, they produce a combined wave that appears to be standing still
    Node = zero amplitude
    Antinode = maximum amplitude
    22
  • 9. Standing Waves
    22
  • 10. Resonance
    Most objects have a natural frequency of vibration
    Resonance
    Increase amplitude occurs when external vibrations match the objects natural frequency
    Music
    Stronger, clearer sounds
    23
  • 11. Resonance
    23