Sound

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Across
  1. 5. A region of a air with relatively many particles.
  2. 7. The height of a wave
  3. 9. A change in pitch of a sound when it starts to move towards or away from you
  4. 12. A series of compressions and rarefactions traveling through a medium
  5. 13. A region empty of matter through which sound cannot travel
Down
  1. 1. Using echoes to find an object.
  2. 2. How loud or quiet a sound is
  3. 3. A region of air with relatively few particles
  4. 4. What boats use to locate objects under water.
  5. 6. The material through which a sound wave travels.
  6. 8. A sound wave that bounces off a surface
  7. 9. The unit with which sound is measured.
  8. 10. How high or low a sound is
  9. 11. A measure of how many times an object vibrates per second