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    • Two types of waves
      • Transverse waves
        • vibrations are perpendicular to the direction of travel.
        • peaks = top part of the wave
        • Troughs = bottom part of the wave
      • longitudinal waves
        • Vibrations are parallel to the direction of travel
          • must travel through a medium
    • properties of waves
      • The speed of the wave is the distance travelled per second
      • sound waves travel at 330 miles per second
      • Light waves travel at      300 000 000 miles per second


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