11.07.2015 Views

Mathematics and Society - OS X Lion Server

Mathematics and Society - OS X Lion Server

Mathematics and Society - OS X Lion Server

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~U&1nI[I§F~15g~~g5(PAGE 2)The human ear is sensitive enough to hear very soft sounds <strong>and</strong> yetstrong enough to st<strong>and</strong>.pain from very loud sounds.No one mechanical instrument canmeasure that range. It is like abalance scale sensitive enough toweigh a single human hair with reasonableprecision <strong>and</strong> strong enoughto weigh the battleship Missouri:(The decibel scale was designed to h<strong>and</strong>le this wide range. It is usedon decibel readers to measure the intensity of a sound. If one sound is10 times as intense as another, its decibel reading would be 10 moredecibels.5. Compare your order of sounds to this chart. Then finish the 2 columnsusing the patterns started.SOUNDRELATIVEINTENSITYDECIBELSthreshhold of hearingleaves rustlingquiet countrysidewhisperquiet office110100100010000o10203040(quiet streetconversationheavy trafficalarm clock (danger level)subwayfood blenderrock groupboiler factory (threshhold of pain)air raid sirensound that burns skinlethal levelnoise weapon316

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