Physics of Hearing - Physics of Hearing There are two...

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Physics of HearingThere are two essential issues concerning the physics of hearing. Both involve understandingsubjective phenomena: loudness and "frequency response". We must distinguish betweenloudness and intensity since intensity is a function purely of the power output of and the distancefrom the source (seeSection A), while loudness is a sensation which depends greatly on anumber of variables, including the sound frequencies being heard. Frequency response is therange of frequencies which a given individual can hear.We measure sound intensity in terms of "decibels". The decibel is a "relative unit" which isactually dimensionless, comparing a given sound to a standard intensity which represents thesmallest audible sound:db = 10 log10( I / I0),(I0is 10- 16W / cm2at 1000 Hz). 0 db thus represents the softest audible sound, while 80 db (ie.,moderately loud music) represents an intensity which is one hundred million times greater. Since

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Term
Spring
Professor
Dr.Vax
Tags
Physics, Decibel, 16 w, 4 000 Hertz

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