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