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Across
  1. 5. minimum or lowest point in a cycle
  2. 8. number of crest of a wave
  3. 10. glass (shape convex and concave)
  4. 11. stationary
  5. 12. region in a longitudinal wave where particle move close together
  6. 13. how high or low the sound is
  7. 15. standing point where the wave has minimum amplitude
  8. 18. vibration of a system
  9. 19. time it takes for one cycle
  10. 20. exterior curved
Down
  1. 1. maximum displacement or distance moved
  2. 2. unit of measurement
  3. 3. curves inward
  4. 4. change in the direction of waves from medium to another
  5. 6. vibration pattern
  6. 7. 2 waves equal of equal frequency
  7. 9. the maximum point upward on the wave cycle
  8. 14. length distance between the crests of a wave
  9. 16. change in direction as they pass through an opening
  10. 17. stream of light