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8th Unit 3

Energy: Sound & Light Key Terms

Acoustics The science of sound: Study of the interaction between sound waves and objects
Amplification Producing sounds that have more intensity than where they were originally produced
Compression Moving molecules closer together as in a gas
Compression wave (longitudinal wave) A wave produced where molecules are pushed closer together and then rebound to their normal position
Crest The highest point of a transverse wave
Density The ratio of mass versus volume: D= m/V
Doppler Effect When sound waves of an object moving relative to the observer take on a different frequency than if they were stationary.
Frequency The number of waves that pass a given point in a given amount of time.
Inner ear Inner most part of the ear that contains the cochlea and nerve endings
Intensity The loudness of sound
Mach I An object reaches this point when it breaks the sound barrier
Medium A substance that sound can travel through
Middle ear The part of the ear that contains the ossicles (ear bones)
Outer ear The part of the ear that receives sound input from the outside world
P wave Primary compression wave that occurs during an earthquake
Pitch The high or low effect of sound based on frequency
Rarefaction The decompression of a compression wave
S wave The transverse wave associated with an Earthquake
Seismograph An instrument that records seismic waves
Sonic Boom The release of a massive sound wave that occurs when an object breaks the sound barrier
Sound barrier The point at which an object exceeds the speed of sound
Sound wave A compression wave that carries energy to a natural or artificial device that can detect pressure changes
Speed of sound 343.2 meters per second or 1,126 ft/s. This is equivalent to 1,236 kilometers per hour or 768 mph
Supersonic An object that can break the sound barrier
Tinnitus Ringing or hissing in the ear as a result of listening to high frequency or high intensity sounds
Trough The lowest part of a transverse wave
Transverse wave A wave that moves energy in one direction but travels in a path that oscillates up and down in equal directions
Wavelength The distance between two crests in a transverse wave or the distance between the compressions of a compression wave.
Angle of incidence The angle at which light hits a reflective surface
Angle of reflection The angle at which light leaves a reflective surface
Diffraction The apparent bending of waves around small obstacles and the spreading out of waves past small openings
Electromagnetic radiation Energy that moves as both a particle and a wave that can travel through any medium
Electromagnetic spectrum The range of all possible wavelengths of electromagnetic radiation
Fiber optics Optical fibers that can carry light over long distances that are used in communication and data transfer
LASER Light Amplification by Stimulated Emission of Radiation
Lens An optical device which transmits and refracts light, converging or diverging the beam.
Mirror A substance that can reflect light efficiently
Photon A bundle of light energy that moves as both a particle and a wave
Primary colors Colors that can be added or subtracted from one another to create other colors. Red, Blue, Green, Cyan, Magenta and Yellow.
Prism A substance that can refract white light separating it into its colored components
Reflection The change in direction of a wave from the surface of a reflective material.
Refraction The bending of a wave when it enters a medium where it's speed changes due to differences in density.
Speed of light The speed at which light travels in a vacuum. (3.00 x 108 m/s)
Wave particle duality Explains the wave and particle characteristics that light exhibits.
Decibel Unit of sound intensity
Created by: darrin_evans