science

5. how high or low you think a sound is
6. the speed at which a wave travels
8. what frequency is expressed in
10. a disturbance that transfers energy from one place to another
12. particles move perpendicularly to the direction the wave travels
14. longitudinal wave that is caused by vibrations and travels through a medium
15. happens when a sound wave matches a natural frequency of an object
16. particles move back and forth in the same direction that the wave travels
17. a reflected sound wave
19. a wave that requires a medium to travel
20. uses of echoes to find objects

1. measure of how well a sound can be heard
2. a measure of how far the particles in the medium move from their normal rest position
3. the material through which a wave travels
4. the time required for one cycle of waves
7. a disturbance in electric and magnetic fields
9. distance from any point on a wave to an identical point on the next wave
11. sound waves that have frequencies greater than 20,000 hertz
13. tells how many waves occur in an amount of time
18. unit used to express loudness