Detecting sound

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Across
  1. 1. the medium that sound travels fastest through
  2. 4. vibrating particles of a sound wave transfer this
  3. 5. the part of a sound wave that determines pitch
  4. 6. the first of the three small bones in the ear
  5. 9. funnels sound waves into the ear
  6. 11. the part of a sound wave that determines volume
Down
  1. 2. the unit of volume
  2. 3. carries electrical impulses to the brain
  3. 4. vibrating particles make this vibrate
  4. 6. the unit of frequency
  5. 7. turns vibration into electrical signals
  6. 8. the third of the three small bones in the ear
  7. 10. second of the three small bones in the ear