Waves Vocabulary

3. A ray that results from entering a second medium with different optical density obliquely.
4. A single short disturbance that moves from one position to another in a field or medium.
9. The time required for one complete vibration to pass a given point in the medium.
10. A series of regularly repeated disturbances of a field or medium.
12. The spreading of waves into the region behind a barrier in the wave's path.
14. The rebounding of a pulse or wave as it strikes a barrier.
16. This states that the resultant displacement at any point is the algebraic sum of the displacements of the individual waves.
19. A vibratory disturbance that propagates through a medium or field.
20. A wave in which the motion of the vibratory disturbance is perpendicular, or at right angles to the direction of travel of the wave.
21. Two points 180 degrees apart are said to be _____________.

1. Two points 360 degrees apart are said to be _____________.
2. The change in direction of a wave due to a change in the speed at the boundary between two different media.
5. This occurs when two or more waves travel through the same medium simultaneously.
6. The line drawn perpendicular to the barrier. This is where angles are measured from.
7. A body of matter.
8. A region of empty space.
11. A wave in which the motion of the vibratory disturbance is parallel to the direction of propagation or travel of the wave through the medium.
13. The number of cycles, or wavelengths, experienced at each point per unit time.
15. The change in observed or apparent frequency due to relative motion of source and observer.
17. A ray that has rebounded from a boundary.
18. A ray that originates in a medium and strikes a boundary of that medium with another medium.