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### Waves vocab

 WAVES   Waves: Rhythmic disturbances that carry energy without carrying matter. ex ocean wave, light wave, sound wave, and color and x rays   Mechanical waves: use of matter to transfer energy  ex. sound waves and ocean waves   Electromagnetic waves: waves that can travel through space where no matter ex light and xray   Transverse waves:a wave energy causes the matter in the medium to move up or down ex. ocean wave   Compressional waves: the matter in the medium moves forward and backward ex sound waves   medium: a mechanical wave travels as energy is transferred from a particle to particle in the medium   crest:high point of a wave   trough: low point of a wave   hertz: the unit of frequency is the number of wavelengths per second   amplitude: a measure of the amount of energy in a wave, the distance from the middle to crest or middle to trough   frequency: is a wave with a number of wavelengths that pass in any given second   wavelength: the distance from the top of one crest to the top of the next crest or from the bottom of one trough to the next.  Wavelength and frequency determine:  light-color    sound-pitch   wave speed: how fast a wave travels through a medium.  mechanical waves travel faster when molecules are closer together.  Electromagnetic waves travel faster when fewer molecules.                                                                             Wave Behaviors   reflection: when a wave strikes a surface it bounces off   Regular reflection: when light waves hit a smooth surface, they bounce back at the same angels, in a regualr way.  You see an image.  example a mirror   Irregular reflection: when light waves hit a rough surface, they bounce off in many different directions.  the reflection is scattered. You do not see a clear image.  ex a white paper.   Refraction: the bending of a wave as it moves from one medium to another is called refraction   Interference: the bending of waves around a barrier is called diffraction   Diffraction: the bending of waves around a barrier is calles diffraction.   Interference: the ability of two waves to combine and form a new wave when they overlap is called interference.   Constructive: When waves meet and the crest of one wave overlaps the crest of the other.  The amplitudes add together makeing a larger wave.   Destructive: When the crest of one wave overlaps the trough of another.  The amplitudes combine to make a smaller wave.