8L Sound

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Across
  1. 2. A thin membrane inside the ear that vibrates when sound reaches it.
  2. 5. Moving backwards and forwards to make a sound.
  3. 8. One complete vibration.
  4. 10. Electrical signals carried by a nerve cell.
  5. 12. Materials that are good at absorbing sound.
  6. 13. How many complete waves produced per second.
  7. 14. Unit for measuring the loudness of a sound.
  8. 17. Unpleasant sound.
  9. 18. The quietest sound that can be heard.
Down
  1. 1. Finds the depth of the sea or finding fish by sending sound waves and listening for the echoes.
  2. 3. When sound bounces back off a surface.
  3. 4. When wave energy moves from one place to another.
  4. 6. The loudness or volume of a sound.
  5. 7. The loudness of a sound.
  6. 8. The part of the ear that changes vibrations into electrical impulses.
  7. 9. Any substance which sound travels through.
  8. 11. How high or low a note sounds.
  9. 15. When sound reflects off a surface.
  10. 16. Drugs used to treat infections.