Loudness is measured in decibels. The formula for the loudness of a sound is given by "dB = 10E - where I, is the intensity of "threshold sound", or sound that can barely be perceived. Other sounds are defined in terms of how many times more intense they are than threshold sound. For instance, a cat's purr is about 316 times as intense as threshold sound, for a decibel rating of: dB = 101og ! = 10log(316 1,) lo = 10log[ 316] = 24.9968708262...or 25 decibels. Considering that prolonged exposure to sounds above 85 decibels can cause hearing damage or loss, and considering that a gunshot from a .22 rimfire rifle has an intensity of about I (2.5 x101)Lo, should you follow the rules and wear ear protection when relaxing at the rifle range?

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