trough

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Across
  1. 3. Highest energy waves on the Electromagnetic Spectrum
  2. 4. Seen in thermal cameras; used in remote controls
  3. 7. Determined by the amplitude of a sound wave
  4. 9. When a wave travels through matter
  5. 11. "Squeezes" in longitudinal waves
  6. 12. Clear
  7. 15. "Soak up"
  8. 16. Bottom of the wave
  9. 17. When waves bounce off of matter
  10. 19. How many waves pass by every second
  11. 21. Lowest energy waves on the Electromagnetic Spectrum
Down
  1. 1. A device that separates white light into the rainbow
  2. 2. Matter that absorbs or reflects light
  3. 5. A bend caused by a change in speed
  4. 6. Determined by the frequency of a sound wave
  5. 8. Radiation found just above visible light; found in sunlight
  6. 10. "Kind of see-through"
  7. 13. The space between compressions on a longitudinal wave
  8. 14. Determines the energy of the wave - Also known as height from origin to crest or trough
  9. 18. Top of the wave
  10. 20. The distance between crests or troughs