Vocabulary Words

2. A wave vibrating at right angles to the direction of its propagation
4. The number of waves that pass a fixed point in a given amount of time
9. The apparent difference between the frequency at which sound or light waves leave a source and that at which they reach an observer
12. A change in the direction of waves as they pass from one medium to another
13. The maximum extent of a vibration or oscillation, measured from the position of equilibrium.
14. The process by which wave energy spreads perpendicularly to the dominant direction of wave propagation
15. A disturbance that moves energy from one place to another
16. A physical quantity that measures the amount of three-dimensional space occupied by matter
18. The change of direction of propagation of a wave when it meets a boundary
20. Occurs when the maxima of two waves add together, so that the amplitude of the resulting wave is equal to the sum of the individual amplitudes.

1. Occurs when waves come together so that they completely cancel each other out
3. Waves that do not require a medium to move their energy away from the source
5. The highest surface part of a wave
6. Waves that require a medium in order to transfer energy away from their source
7. A region in a longitudinal wave where the particles are furthest apart
8. The lowest part in a wave
10. The distance from one crest to another, or from one trough to another, of a wave
11. A measure of how high or low something sounds
17. A wave vibrating in the direction of propagation
19. Areas of the wave the molecules get bunched together