However, the range in sound intensity is so great, the human ear can pick up the sound of a fingertip brushed over someone’s skin as well as incredibly loud engines. The human ear is tremendously sensitive, and the dB scale is designed to measure that sensitivity. Now we can find "I" by using our calculators to raise 10 to the -0.9 power. The decibel (dB) is the unit of measurement that describes the intensity of sound. A child's voice is high frequency, for example. In daily life, this corresponds to how low- or high-pitched something is. Frequency, reported in Hertz (Hz), measures the number of sound vibrations in one second. If not, then we can rewrite this in exponential form: It can be measured in two ways: frequency and amplitude. If you know how to do inverse logarithms on your calculator you can find "I" now. And since by definition this becomes -12.
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