Waves

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Across
  1. 3. Waves energy dies off in soft material
  2. 5. Shift: Siren drives by, its pitch changes
  3. 7. Waves travel perpendicular
  4. 12. Top of a wave
  5. 13. Light can pass through clearly
  6. 14. Spectrum: An ordered list of all types of electromagnetic radiation
  7. 17. Part of a wave bends around a corner
  8. 19. Coils are squeezed together
  9. 20. Wave bends when entering a transparent boundary
Down
  1. 1. Bottom of a wave
  2. 2. Distance of two identical points
  3. 4. Light can pass through, yet not entirely clear
  4. 6. Wave bounces off when it hits a hard boundary
  5. 8. Waves travel parallel
  6. 9. Matter in which waves travel in
  7. 10. When two waves overlapped and interact
  8. 11. Coils are stretched apart
  9. 15. The number of waves that pass a given point
  10. 16. Distance from rest to crest
  11. 18. Light can not pass in