Electromagnetic Waves

2. in reflection the perpendicular to the strip at the point where the incident ray strikes i called the ___
7. in a transverse wave the direction of the disturbance is at __ angles to the direction of the travel of the wave
8. waves travel more slowly in ___ water
10. 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
11. the distance moved in the direction of travel of the wave by a crest or any point of the wave in 1 second
15. a line on which the disturbance has the same phase at all points
16. other name for progressive wave
17. ____ waves are produced by a disturbance
18. the change in the direction of travel of the waves which occurs when their speed and hence wavelength changes

1. in greek wavelength is represented by
3. ___ is a disturbance which carries energy from one place to another without transferring matter
4. points are out phase with other points because their directions of vibration are ___
5. in a ripple tank straight wavefronts are produced by a ____ bar
6. the distance between successive crests
9. the spreading of waves at the edge of obstacles
12. angle of incidence and angle of reflection are always ___
13. the number of complete waves generated per second
14. waves travel faster in ___ water
19. a line drawn at right angles to a wavefront, which shows its direction to travel
20. the frequency of a wave is also the number of __ passing a chosen point per second