Sound Waves and Hearing

4. The use of echoes,or reflected sound waves to find objects
5. The distance from any point on a wave to an identical point on the next wave
8. The way that frequency is expressed
9. How high or low you think a sound is
10. A longitudinal wave that is caused by vibrations and travels through a medium
13. Sound waves that have frequencies greater than 20,000 Hz
14. A system that uses sound waves to determine the location of objects or to communicate
15. Particles move back and forth in the same direction that the wave travels or parallel to the wave
16. The speed at which a wave travels
18. The time required for one cycle

1. The material through which a wave travels
2. A common unit used to express loudness
3. A disturbance that transfers energy from one place to another
4. A disturbance in electric and magnetic fields
6. The particles move perpendicularly to the direction the wave travels
7. The maximum distance that the particles of wave's medium vibrate from their rest position
11. A measure of how well a sound can be heard
12. A wave that requires a medium through which to travel
17. Tells how many cycles occur in an amount of time, usually 1 s