Sound Waves and Hearing

3. Tells how many cycles occur in an amount of time.
6. WAVE A disturbance in electric and magnetic fields.
7. Frequencies greater than 20,000 Hz.
10. The use of echoes, or reflected sound waves to find objects.
12. WAVE Particles move perpendicularly to the direction the wave travels.
13. A disturbance that transfers energy from one place to another.
16. How high or low you think a sound is.
17. A measure of how far the particles in the medium move away from their normal rest position.

1. EFFECT A change in the observed frequency of a wave when the sound source, the observer, or both are moving.
2. The distance from any point on a wave to an identical point on the next wave.
4. WAVE The particles of a medium vibrate in the same direction that the wave travels.
5. A unit of frequency equal to one cycle per second.
8. The most common unit used to express loudness.
9. A longitudinal wave that is caused by vibrations and travels through a medium.
11. WAVE A wave that requires a medium through which to travel.
14. The material through which a wave travels.
15. A measure of how well a sound can be heard.