waves

7. wave consisting of a periodic disturbance or vibration that takes place in the same direction as the advance of the wave.
8. the time required for one complete cycle of vibration to pass a given point.
9. the net effect of the combination of two or more wave trains moving on intersecting or coincident paths
11. the spreading of waves around obstacles.
12. a periodic motion that repeats itself in a regular cycle

1. the bending of a ray when it passes at an angle from one medium into another in which its speed is different
2. the number of waves that pass a fixed point in unit time.
3. the maximum extent of a vibration or oscillation, measured from the position of equilibrium.
4. The highest surface part of a wave
5. a wave that is not capable of transmitting its energy through a vacuum.
6. the reduction in volume (causing an increase in pressure) of the fuel mixture in an internal combustion engine before ignition.
10. bottom of wave