Sound waves

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Across
  1. 2. This is where sounds cannot be heard
  2. 4. This makes the sound
  3. 7. Relating to wavelength
  4. 10. This is a part of the ear that vibrates
  5. 13. How much something moves past a starting point
  6. 16. A unit of measuring frequency
  7. 18. A part of the ear that has a fluid in it and is shaped like a snail
  8. 19. Where the cochlea and eardrum are
  9. 20. This happens when a soundwave bounces off of something
  10. 21. This is a synonym of sound
Down
  1. 1. Every instrument does this when making a sound
  2. 3. Another word for frequency
  3. 5. This is the title of the crossword
  4. 6. This is an object that helps if you have hearing loss
  5. 8. High amplitude
  6. 9. Low amplitude
  7. 11. How long a sound wave is
  8. 12. This is relating to strength
  9. 14. Where the sounds are heard, body part, you have 2
  10. 15. A unit of measuring noise level
  11. 17. A transfer of force that makes up sound waves