Sound Energy

3. A pulling force that stretches an object, such as a string or wire; more tension makes sound waves travel faster and raises the pitch.
7. The distance between two compressions or two rarefactions.
8. A man-made system that uses sound waves to detect objects underwater.
9. The unit used to measure how loud or soft a sound is.
10. A sound that bounces off a surface and returns to the listener.
11. The height of a wave; determines how loud a sound is.
12. The number of wavelengths in a given unit of time.
14. A sound wave where particles are pushed closed together or spread out as sound energy travels through them.
15. A space with no matter or air; sound cannot travel through a vacuum.

1. How high or low a sound is; determined by the frequency of the sound wave. (Ex. high frequency = high pitch, low frequency = low pitch).
2. The part of a sound wave where particles are pushed close together.
4. A form of energy produced and transmitted by vibrating matter that can be heard.
5. The part of a sound wave where particles are spread apart.
6. The material through which sound travels (solid, liquid, or gas).
13. Using echoes to locate objects; used by bats and dolphins.