waves

1. The sensation of a frequency
4. what makes a particular musical sound different from another, even when they have the same pitch and loudness
7. the change in direction of a wave passing from one medium to another caused by its change in speed
8. the number of crests of a wave that move past a given point in a given unit of time
11. wave a wave produced by the acceleration of an electric charge and propagated by the periodic variation of intensities of, usually, perpendicular electric and magnetic fields
12. a fixed relationship between the phases of waves in a beam of radiation of a single frequency
13. the change in direction of a wave front at an interface between two different media so that the wave front returns into the medium from which it originated
16. the separation of white light into a color spectrum by a prism
17. Angle the angle of incidence that provides an angle of refraction of 90-degrees
18. Internal reflection a phenomenon which occurs when a propagating wave strikes a medium boundary at an angle larger than a particular critical angle with respect to the normal to the surface
19. A substance that makes possible the transfer of energy from one location to another, especially through waves
20. of Reflection the angle that a ray of light or the like, reflected from a surface, makes with a normal to the surface at the point of reflection
22. lowest point of a wave

2. the highest point of a wave
3. Harmonic Motion where the restoring force is directly proportional to the displacement and acts in the direction opposite to that of displacement.
5. a unit used to measure the intensity of a sound or the power level of an electrical signal by comparing it with a given level on a logarithmic scale
6. The distance between one peaks of a wave to the next corresponding peak
9. the reduction of an item's density, the opposite of compression
10. the rate at which energy flows through a unit area perpendicular to the direction of wave motion
13. power is the ability of an imaging device to separate points of an object that are located at a small angular distance or it is the power of an optical instrument to separate far away objects that are close
14. image an image from which rays of reflected or refracted light appear to diverge, as from an image seen in a plane mirror
15. difference the difference in path traversed by the two waves, measured in terms of wavelength of the associated wave
21. A device that produces a very narrow, highly concentrated beam of light