Across
- 5. a measure of how far the particles in the medium move away from their normal rest position
- 6. a change in the observed frequency
- 8. how high or low a sound is
- 10. the use of echoes, or reflected sound waves to find objects
- 11. when a sound wave matches the natural frequency of an object and causes the object to vibrate
- 12. particles that move perpendicularly to the direction the wave travels
- 13. particles of a medium vibration in the same direction
- 17. sound waves that have frequencies greater than 20,000 hertz.
- 18. a longitudinal wave that is caused by vibrations
- 20. the speed at which waves travel
Down
- 1. a wave that requires a medium through which it travels
- 2. a system that uses sound waves to determine the location of objects to communicate
- 3. a disturbance in electric and magnetic field
- 4. what frequency is expressed in
- 7. a reflected sound wave
- 9. how to measure loudness
- 14. two or more waves overlapping or combine to form one wave.
- 15. the material through which waves travel
- 16. a measurement of how loud something is
- 19. a disturbance that transfer energy for one place to another