http://hyperphysics.phy-astr.gsu.edu/hbase/sound/db.html decibel http://hyperphysics.phy-astr.gsu.edu.../sound/db.html http://hyperphysics.phy-astr.gsu.edu/hb ... nd/db.html see this article Hyperphysics description of decibels Decibels this source decibel http://hyperphysics.phy-astr.gsu.edu/hbase/sound/db.html#c1 Decibels Decibels decibel http://hyperphysics.phy-astr.gsu.edu.../sound/db.html http://hyperphysics.phy-astr.gsu.edu/hbase/sound/db.html#c1 Hyperphysics description of decibels decibels Hyperphysics Hyperphysics description of decibels decibel Decibel Levels Hyperphysics Decibel calculation Hyperphysics description of decibels Hyperphysics description of decibels Hyperphysics description of decibels http://hyperphysics.phy-astr.gsu.edu.../sound/db.html Decibels decibels Hyperphysics description of decibels