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.
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.