Waves

1. The particles in a medium vibrate parallel to the direction of the wave.
5. The distance from one crest to another or from one trough to another.
7. Materials that don’t allow transmissions of light waves.
8. The lowest point of a wave.
9. The number of waves that pass a fixed point in unit time.
11. Materials that almost all light gets passed through.
14. When waves bounce back from a barrier they cannot pass through.
15. The spreading of waves around obstacles.
16. A region in a longitudinal wave where the particles are closest together.

2. Materials that allow only some frequencies of light to pass through.
3. A region in a longitudinal wave where the particles are farthest apart.
4. Matter that waves are traveling through.
6. The transfer of the energy of a wave to matter as the wave passes through it.
10. The highest point of a wave.
12. The motion of the particles is perpendicular to the direction of the wave.
13. When waves bend as they enter a new medium at an angle.