Waves

2. electromagnetic waves between radio waves and infa-red radiation in the electromagnetic spectrum used in communication and microwave ovens
3. return of waves after they reach a smooth surface
5. bottom point of a wave
7. electric and magnetic disturbances that transfer energy from one place to another
10. points along a crest or trough of a wave as it progresses
12. the maximum distance of any part of a wave from its undisturbed position
13. flat surface
15. change of direction of waves when they travel across a boundary where their speed changes

1. spreading of waves when they pass through a gap or around an obstacle
4. distance traveled by a wave crest or a wave through per second, measured in m/s, speed of a wave= wavelength frequency
6. the distance from one wave crest to the next, symbol λ lambda measured in metres
8. waves in which the direction of vibration is parallel to the direction in which the waves are travelling
9. waves in which the direction of vibration is perpendicular to the direction in which the waves travel
11. number of complete waves passing a point from its undisturbed position
14. top point of a wave