The decibel level for the intensity of a sound is a logarithmic scale defined by D =
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The decibel level for the intensity of a sound is a logarithmic scale defined by D = 10 log10 I + 120, where I is the intensity of the sound in watts per square meter.
(a) Express I as a function of D.
(b) Show that when D increases by 20, the intensity increases by a factor of 100.
(c) Compute dI/dD.
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