Wave basics

2. A unit for angle, often used for measuring the phase difference between two waves
6. A wave in which the energy travels continuously outward away from the source
8. The 'spreading out' of wave energy as a wave goes through a gap.
9. Light coming from the sun is ___________
12. a wave where the oscillation of particles is perpendicular to the direction of travel of the wave
16. A type of interference in which two waves cancel each other out
17. A frequency of 4 Hz means four waves pass each ______

1. A type of wave that needs a material (medium) to travel through
3. The maximum displacement of particles in a wave
4. 330 m/s is the speed of this type of wave through air
5. the opposite of crest
7. When two or more waves meet
10. In a longitudinal wave, the oscillation of particles is _______ to the direction of travel of the wave
11. The time between one wave crest arriving and the next wave crest arriving
13. Light is an example of this type of wave
14. A type of wave in which energy remains confined in a fixed region
15. the distance from one crest of a wave to the next