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2. A material in which a wave travels is called a
5. The distance between one point on a wave to the same point on the next wave is the
6. Frequencies above 20 Hz and 20,000 Hz is called
8. is a wave that travels only through matter.
9. the top of a wave
15. a space entirely devoid of matter.
19. a straight line at an angle of 90° to a given line, plane, or surface.
20. side by side and having the same distance continuously between them.
21. he sections where the particles in the medium are closest together are
22. he perception of how high or low a sound seems is

1. s the amount of sound energy that passes through a square meter of space in one second.
3. causes the particles in a medium to move parallel to the direction that the wave travels.
4. is a longitudinal wave that can travel only through matter.
7. a wave vibrating at right angles to the direction of its propagation.
10. The regions where the particles are farthest apart are
11. how you percieve the energy of a sound wave
12. is a back-and-forth or an up-and-down movement of an object.
13. is a disturbance that transfers energy from one place to another without transferring matter.
14. bottom of a wave
16. of a wave is the maximum distance that the wave moves from its rest position.
17. are mechanical waves because they move through matter.
18. a wave is the number of times the pattern repeats in a given time.