LIGHT AND SOUND

2. A form of energy that can travel through a vacuum.
6. The band of colors produced when white light is dispersed.
8. The perception of how high or low a sound is.
10. A type of wave in which particles move parallel to the direction of wave travel.
12. The bouncing back of a wave after it strikes a surface.
14. A detection system that uses electromagnetic waves to locate objects.
16. The distance between two consecutive crests or compressions of a wave.
18. A navigation system that uses reflected sound waves to detect underwater objects.
19. The bending of light as it passes from one medium to another.
20. A region without matter where sound cannot travel.
21. A disturbance that transfers energy from one place to another.
22. A reflected sound heard after bouncing off a surface.
23. The material through which sound waves travel.

1. A medical imaging technique that uses high-frequency sound waves.
3. The maximum height of a wave from its resting position.
4. An object in orbit that transmits communication and navigation signals.
5. A transparent object that separates white light into different colors.
7. A satellite-based navigation system used to determine location.
9. A type of wave in which particles move perpendicular to the direction of wave travel.
11. The back-and-forth motion that produces sound waves.
13. Describes waves that do not require a medium to travel.
15. A concentrated beam of light commonly used in medicine and communication.
17. The number of wave cycles that pass a point in one second.
18. A mechanical wave that requires a medium to travel.