CP4 Waves

4. The distance between a point on one wave and the same point on the next wave.
7. A straight line with an arrow showing the direction of a beam of light.
8. The time taken for one complete wave to pass a point.
9. A wave where the vibrations are at right angles to the direction the wave is travelling.
10. An imaginary line at right angles to a surface where a ray of light hits it.
11. The unit for frequency.
13. The angle between an incoming light ray and the normal.
15. A way of transferring energy or information but not mass.

1. A wave where the particles vibrate in the same direction as the wave is travelling.
2. The change in direction when waves change speed go
3. Any substance through which something travels.
5. The maximum distance a particle moves from its resting position when a wave passes.
6. The number of vibrations per second.
12. The boundary between two materials.
14. Vibrations in the rocks of the Earth caused by earthquakes or explosions.