Waves

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Across
  1. 5. The number of waves per second
  2. 7. The height of a wave, measured from the centre line
  3. 8. The bottom of a wave
  4. 9. The top of a wave
Down
  1. 1. A wave with oscillations parallel to the direction of travel
  2. 2. The length of one complete wave
  3. 3. Another word that means vibration
  4. 4. A wave with oscillations perpendicular to the direction of travel
  5. 6. The unit of frequency