CP4 Waves

3. A wave where the vibrations are at right angles to the direction the wave is travelling.
6. The distance between a point on one wave and the same point on the next wave.
8. Any substance through which something travels.
10. The boundary between two materials.
11. A way of transferring energy or information but not mass.
15. Waves made by a vibrating charge, all travel at the speed of light in vacuum.
16. The change in direction when waves change speed going from one medium into another.
17. An imaginary line at right angles to a surface where a ray of light hits it.

1. are transverse and longitudinal seismic waves.
2. A wave where the particles vibrate in the same direction as the wave is travelling.
4. Vibrations in the rocks of the Earth caused by earthquakes or explosions.
5. The number of vibrations per second.
7. The maximum distance a particle moves from its resting position when a wave passes.
9. The unit for frequency.
12. Empty space.
13. The time taken for one complete wave to pass a point.
14. Vibrations in the particles of a solid, liquid or gas detected by our ears.