WAVES

3. A disturbance that transfers energy but does not cause a permanent displacement of the particles of the medium.
6. Number of complete oscillations in one second.
9. S.I. unit of frequency.
10. Maximum vertical displacement of a particle from rest.
12. Means 1,000
13. Travels in vacuum; does not require material medium.
15. Water waves is a ____ wave.
16. Electromagnetic waves travel at the speed of ___.
17. Complete vibration or oscillation of a particle or wave.
18. When waves travel from one part of a medium to another, they are ___.
19. S.I. unit of amplitude and wavelength.

1. Describes when two lines form angle 90 when they cross each other.
2. Waves whose particles vibrate in same direction as the direction of the wave.
4. Requires material medium to travel.
5. Two waves traveling in opposite direction with the same amplitude form a ____ wave when they meet.
7. Time to complete one oscillation.
8. Obtained when wavelength is divided by period.
11. Waves in which direction of particle vibration is perpendicular to direction of wave.
14. Length of one cycle.