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14 terms

Portage 7 Sound Ch. 2

STUDY
PLAY
sound
Wave produced by vibrations that can travel through a medium.
vibration
Rapid back-and-forth motion.
vacuum
Space with few or no particles where sound can't travel.
pitch
Highness or lowness of sound; higher frequency = higher pitch.
hertz
Unit to measure frequency.
ultrasound
Sound with frequency higher than 20,000 hertz.
resonance
Strengthening of a sound wave when it combines with an object's natural vibration.
Doppler effect
Change in pitch that occurs when the source or hearer is moving.
intensity
Amount of energy a sound wave has (loudness).
decibel
Unit to measure intensity of a sound wave.
amplification
Increasing the strength of an electrical signal to increase intensity (loudness) of a sound.
acoustics
Scientific study of sound.
echolocation
Finding location by sending out ultrasound waves and interpreting the returning echoes.
sonar
Instuments that use echolocation to locate objects under water.