Waves

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Across
  1. 5. The distance between similar points on consecutive waves
  2. 6. The type of wave we hear
  3. 7. The point at which a wave starts
  4. 8. The high point of a wave
  5. 10. How often a wave passes by a fixed point
  6. 12. The type of wave we see
Down
  1. 1. A wave whose particles move perpendicular to its direction
  2. 2. How fast a wave moves
  3. 3. The type of wave we can observe without any device
  4. 4. The length of time needed for one complete wave
  5. 9. The low point of a wave
  6. 11. A wave who particles move parallel to its direction