Electromagnetic Waves

7. a line drawn at right angles to a wavefront, which shows its direction to travel
8. a line on which the disturbance has the same phase at all points
9. waves travel faster in ___ water
12. ____ waves are produced by a disturbance
13. in greek wavelength is represented by
14. ___ is a disturbance which carries energy from one place to another without transferring matter
15. in a transverse wave the direction of the disturbance is at __ angles to the direction of the travel of the wave
16. the spreading of waves at the edge of obstacles
18. the distance between successive crests
19. angle of incidence and angle of reflection are always ___
20. in reflection the perpendicular to the strip at the point where the incident ray strikes i called the ___

1. is the height of a crest or the dept of a through measured from the undisturbed position of what is carrying the wave, such as rope
2. in a ripple tank straight wavefronts are produced by a ____ bar
3. waves travel more slowly in ___ water
4. the frequency of a wave is also the number of __ passing a chosen point per second
5. points are out phase with other points because their directions of vibration are ___
6. other name for progressive wave
10. the change in the direction of travel of the waves which occurs when their speed and hence wavelength changes
11. the distance moved in the direction of travel of the wave by a crest or any point of the wave in 1 second
17. the number of complete waves generated per second