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exhibit a <br />Decibels are units <br />of sound as meas ­ <br />ured by a decibel <br />meter. Sounds <br />quieter than 10 <br />decibels are diffi­ <br />cult for the human <br />ear to hear, and <br />sounds that are <br />louder than 120 <br />decibels are pain ­ <br />ful to the human <br />ear. <br />I Jet Engine I <br />V at 100 feet J <br />mn—iAMrmT-