Waves Crossword

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Across
  1. 3. Dark area formed when light is blocked
  2. 5. The highest point of a wave
  3. 7. Maximum height of a wave from its middle line
  4. 8. Something that lets light to pass straight through
  5. 10. Spiral, snail-shell-shaped organ in the inner ear
  6. 11. Waves that move up and down
  7. 12. Waves that move parallel (side to side)
Down
  1. 1. Number of wave cycles per second
  2. 2. Distance from one wave peak to the next
  3. 4. Unit used to measure sound volume or loudness
  4. 6. Something that lets some light through
  5. 9. Something that lets no light through
  6. 11. The lowest point of a wave