Log 3.4 52. The base-10 logarithmic scale is used to adequately express this enormous range. Decibels are the base-10 log of an intensity ratio multiplied by 10. A is 3 dB IL greater than sound B. Compute the dB IL values of following ratios. Our ear, for instance, is a pressure sensitive organ as is the microphone used to record sound.
Pressure is the amount of force per unit area.
N dB , of course, is the number of decibels. Decibels are the base-10 log of a pressure ratio multiplied by 20. Conversely, if you know the dB SPL, you can figure out the sound pressure ratios and the absolute sound pressure levels. When you add 40 dB IL to a 40 dB IL sound, the result is not a 80 dB IL sound. Calculate the decibel value of a 40 dB IL sound when 40 dB is added to it.