WAVES

2. another name for the crest of a wave
3. the top of a wave
6. the spread out section of a longitudinal wave
8. transverse waves oscillate in this direction
11. these can travel through a vacuum
12. a measure of the time taken for one full oscillation
14. the smallest angle for total internal reflection
17. these need a medium to travel through
19. the spreading out of white light into a rainbow
20. the bottom of a wave
21. when a wave spreads out due to going through a gap or around a barrier
23. when a wave bends due to entering a medium with different optical density

1. longitudinal waves oscillate in this direction
4. occurs when the incident ray, travelling from glass to air, is larger than the critical angle
5. waves that oscillate perpendicular to their direction of energy transfer
7. sound waves are an example of this type of wave
9. the distance from the midpoint to the maximum point on a wave
10. the squashed up section of a longitudinal wave
13. a triangular block of glass used to spread light out into a rainbow
15. when a wave bounces back at the same angle
16. the distance it takes for a wave to repeat itself
18. a regular pattern of disturbance that can transfer energy from one position to another
22. the SI unit for frequency