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What Is Sound?

What Is Sound? Sound is a pressure wave which iscreated by a vibrating vibrations set particles in the sur-rounding medium (typical air) invibrational motion, thus transportingenergy through the the particles are moving inparallel direction to the wave movement,the sound wave is referred to as alongitudinal result of longitudinal waves is thecreation of compressions andrarefactions within the alternating configuration of C andR of particles is described by the graphof a sine wave (C~crests, R~troughs)

passing motorcycle 90 dB somebody shouting 100 dB pneumatic drill 100 dB helicopter 110 dB loud rock concert 110 dB air raid siren 130 dB pain threshold 120 dB gunshot 140 dB rocket launch 180 dB Examples for Sound Levels in Decibel Instant perforation of eardrum 160 dB 1) TOH: One-billionth of a centimeter of molecular motion

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