Sound waves and hearing

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Across
  1. 4. The point of the wave that moves up
  2. 5. A disturbance that transfers energy from one place to another
  3. 6. The distance from any point on a wave to an identical point on another wave
  4. 9. Requires a medium to travel
  5. 12. When you squeeze the coils closer together
  6. 14. When you spread the coils apart
  7. 15. Particles of the medium move perpendicularly to the direction the wave is traveling
  8. 16. A measure of how far the particles in the medium move away from their rest position
  9. 18. How high or low you thing a sound is
  10. 19. A measure of how well a sound can be heard
Down
  1. 1. The unit to express loudness
  2. 2. Tells how many cycle occur in an amount of time
  3. 3. The speed at which waves travels
  4. 7. A disturbance in electric and magnetic fields
  5. 8. The point of the wave that moves down
  6. 10. The unit of frequency
  7. 11. Particles move back and forth in the same direction that the wave travels,or parallel to the wave
  8. 13. A longitude wave that is caused by vibrations
  9. 17. The material through which a wave travels