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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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