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    Waves vocab

    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.