Kola's Wave Crossword Puzzle

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Across
  1. 6. Area of longitudinal wave where the coils are close together
  2. 7. the material which a wave travels through
  3. 8. lowest point of a wave
  4. 11. point of no motion
  5. 12. the number of times something occurs in a given period of time
  6. 13. a position of maximum displacement
  7. 14. a wave that doesn't need a medium to travel
  8. 17. the motion of the medium is perpendicular to the direction of the wave
  9. 18. 2 waves combining by adding their displacement together
Down
  1. 1. some points remain fixed, some vibrate to max amplitude
  2. 2. magnitude of displacement from origin
  3. 3. Waves move the medium parallel to the direction in which the waves travel.
  4. 4. waves that require a medium
  5. 5. when 2 waves cancel each other out, by being opposites
  6. 9. distance between neighboring crests
  7. 10. highest point of a wave
  8. 15. particles spread apart in a longitudinal wave
  9. 16. time