waves

4. of a wave tells how many cycles occur in an amount of time
7. is a measure of how well a sound can be heard
8. is a reflect sound wave
10. depends on the properties of medium
12. is the distance from any point on a wave to an identical on the next wave
14. is a disturbance in electric and magnetic field
15. a material through which a wave travels
17. is the time required for one cycle
18. wave the requires a medium
19. particles move perpendicularly to the direction the wave travels

1. effect is a change in the observed frequency of a wave
2. happens when two or more waves overlap and combine to form one wave
3. animals that use of echoes or reflected sound waves to find object
5. particles move back and forth in the same direction that the travels or parallel to the wave
6. happens what a sound wave matches the nature frequency of an object and causes the object to vibrate
9. the most common unit used to express loundness
11. is a measure of how far the particles in the medium move away from their normal rest position
13. is how high or low you think a sound is
16. is a system that used sound wave to determine the location of object or to communicate
20. a disturbance that transfers energy from one place to another