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)The speed of a sound pressure wave in air + m/s , Tc temperature in CelsiusThe particles do not move down the waywith the wave but osciallate back and forthabout their individual equilibrium amount of work done to generate the energy that sets the particlesin motion is reflected in the degree of displacement which is measuredas the amplitude of a frequency f of a wave ismeasured as the number of completeback-and-forth vibrations of a particleof the medium per unit of Hertz = 1 vibration/secondf = 1/TimeDepending on the medium, soundtravels at some speed c which definesthe wavelength l: l = c/fWavelength, Amplitude, Frequency of a WaveMeasuring the Intensity of Sound The softest audible sound modulates the air pressure by around 10-6 Pascal (Pa).

Instant perforation of eardrum 160 dB 1) TOH: One-billionth of a centimeter of molecular motion 2) The most intense sound (without physical damage) is one trillion times more intense. Humans vs Machines on similar tasks (2001) Tasks Vocabulary Humans Machines Connected digits 10 0.009% 0.72% Alphabet letters 26 1% 5%

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