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Light and Sound Voca

Light and Sound Unit Vocabulary

Compression The bunching up of molecules as vibration travels through matter
Rarefaction The spreading out of molecules as vibration travels through matter
Amplitude The amount of energy in a compression. Changes in amplitude affect loudness of sound.
Frequency The number of wavelengths in a given period of time. Changes in frequency affect pitch.
Pitch The high or low of sound. It is directly related to the frequency. High frequency results in high pitch. Low frequency results in low pitch.
Echolocation Sound waves that hit an object and then bounce back toward the source of the sound. It is used by animals to locate food and avoid danger.
Sonar Sound waves that hit an object and then bounce back toward the source of the sound. It is used by humans to locate objects.
Wavelength The distance from a point on one wave to that same point on the next wave--usually from crest to crest or trough to trough. In a sound wave, wavelength is the distance between two compressions or two rarefactions.
Crest The top of a wave
Trough The bottom of a wave
Reflection The bouncing back of light when it comes into contact with an object or substance
Refraction The bending of light as it passes through an object or substance
Transparent A material that allows most light to pass through it. Objects can be clearly seen through a transparent material.
Translucent A material that allows some light to pass through it. Objects can be seen but not clearly through a translucent material.
Opaque A material that does not allow light to pass through it. Objects cannot be seen through an opaque material.
Visible Spectrum The part of the electromagnetic spectrum that can be seen by the human eye. Colors are red, orange, yellow, green, blue, and violet.
Prism A tool that bends (refracts) white light into the colors of the visible spectrum and then disperses (separates) the light.
transmission Light passing straight through an object.
compression wave the way sound travels as vibrating matter with areas of compression and areas of rarefaction.
transverse wave the way light travels typically in an up and down motion.
absorption the taking in by a substance of light waves and converting the light energy to heat energy.
independent variable what the experimenter changes in an experiment for an expected result
dependent variable What may change as a result of the independent variable
Created by: klennartz