Waves Review

7. The process of using reflected sound waves to find objects, used by animals such as bats.
9. The extent to which a sound can be heard.
11. An observed change in the frequency of a wave when the source or observer is moving.
13. A wave in which the particles move perpendicularly (up and down).
18. A wave that can travel without a medium.
19. The material through which a wave can travel.
20. The distance from any point on a wave to the corresponding point on the next wave.

1. A reflected sound wave.
2. A measure of how high or low a sound is perceived to be, depends on frequency.
3. The most common unit used to measure loudness.
4. A wave in which the particles move parallel (side to side).
5. The time required for corresponding points on consecutive waves to pass a given point.
6. A longitudinal wave that is caused by vibrations and travels through a material medium.
8. How quickly a wave travels, depends on the medium.
10. Sound navigation and ranging, a system that uses acoustic signals and returned echoes to determine the location of objects.
12. A disturbance that transfers energy from one place to another.
14. The maximum distance that the particles of a wave's medium vibrate from their rest position.
15. A wave that requires a medium through which to travel.
16. The number of cycles, such as waves, in a given amount of time.
17. A unit of frequency equal to one cycle per second.