The reference intensity I 0, corresponding to a level of 0 decibels, is approximately the intensity of a wave of 1,000 hertz frequency at the threshold of hearing-about 10 -12 watt per square metre. Here L represents decibels, which correspond to an arbitrary sound wave of intensity I, measured in watts per square metre.
Such a scale is provided by the sound intensity level, or decibel level, of a sound wave, which is defined by the equation Because of the enormous nonlinearity of the ear in sensing pressure waves, a nonlinear scale is convenient in describing the intensity of sound waves. The ear mechanism is able to respond to both very small and very large pressure waves by virtue of being nonlinear that is, it responds much more efficiently to sounds of very small amplitude than to sounds of very large amplitude.
#Normal decibel level how to
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