Transcription of What Is Sound?
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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)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
Decibel is defined as: 20 log 10 (P/P 0) • Thus +20 dB means an increase in pressure by a factor of 10. Threshold of hearing 0 dB softest audible 1000 Hz sound 6 dB q uiet living roo m 2 0 d B s oft whispering 2 5 dB refrigerator 40 dB soft talking 50 dB normal conversation 60 dB ...
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