The decibel level of a sound having the threshold intensity of 10 −12 W/m 2 is β = 0 dB, because log 10 1 = 0. Sound-intensity level definition is - the relative sound intensity at any point in a sound field as compared with a specified standard intensity that is usually expressed in … That is, the threshold of hearing is 0 decibels. The dynamic range of human hearing and sound intensity spans from 10-12 W/m 2 to 10 - 100 W/m 2.
This span makes absolute values for sound intensity impractical in normal use. Sound Intensity Level. Bel is a very large unit of intensity level of a sound.Generally,a smaller unit called decibel is used. The electric power level, or the acoustic intensity level, is a quantity expressing the ratio of two electrical powers or of two sound intensities in logarithmic form. Table 1 gives levels in decibels and intensities in watts per meter squared for some familiar sounds. The highest sound intensity possible to hear is 10,000,000,000,000 times as loud as the quietest! Decibel is abbreviated as (dB).It must be remembered that 1 bel is equal to 10 dB.If the intensity level is measured in decibels,then equation (4) becomes: Intensity level = … The unit is the decibel (dB).
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