Waves Crossword Puzzle

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Across
  1. 1. how often
  2. 4. frequency X wavelength
  3. 6. light you can see
  4. 7. something to travel through
  5. 8. area in a longitudinal wave that is spread apart
  6. 10. wave that needs a medium to travel through
  7. 11. distance between trough-trough or crest-to-crest
Down
  1. 2. area in a longitudinal wave that is close together
  2. 3. distance from the resting position to crest
  3. 5. movement back and fourth
  4. 9. never touch
  5. 12. unit for measuring