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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.
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