Waves

4. diverging lens
5. waves caused by earthquakes
6. ray bounced away from a surface
9. transferred by waves
14. when a surface bounces back energy towards the source
17. the direction of light when it travels from solid to air in relation to the normal
20. wave eg sound
21. absorbs all radiation
24. wave seen in water
26. wavelength between 2mm and 30cm used fro cooking and communication
30. time for one wave to pass a point
31. does not allow light through
32. layer of the upper atmosphere that refracts radio waves
33. allows light through but you cannot see through it
37. image projected on a screen
38. number of waves/second

1. image that can be seen but not projected on a screen
2. converging lens
3. ray coming towards a surface
7. electromagnetic waves ordered according to wavelength and frequency
8. reflection of sound
10. ray at right angles to the surface
11. in a longitudinal wave when particles are spread out
12. waves that allow the skin to make vit D
13. the direction of light in relation to the normal when going from air to solid
15. transverse wave cannot travel through liquids
16. shortest wavelength in the electromagnetic spectrum
18. when a ray changes direction when it changes medium
19. in a longitudinal wave when particles are squashed
22. longest wavelength used for communication
23. generated when high speed electrons collide with metals
25. longitudinal seismic wave that is slower in liquids than solids
27. displacement/height of a wave
28. distance from one wave to the next
29. measurement for frequency
34. used to measure wave speed in water
35. frequency of sound above 20kHz
36. equals frequency x wavelength