1. When Washingtonâs father Augustine died in 1743, George Washington became a slave owner at the early age of eleven. In his will, Augustine left his son the 280 acre family farm near Fredericksburg, Virginia. In addition, Washington was willed ten slaves.
On the decibel scale, the smallest audible sound (near total silence) is 0 dB. A sound 10 times more powerful is 10 dB. A sound 100 times more powerful than near total silence is 20 dB. A sound 1,000 times more powerful than near total silence is 30 dB.
Anything in the range of 140 decibels, like a jet engine, is an immediate danger to your hearing. Exposure could create acoustic trama resulting in immediate deafness. Around 125 decibels, roughly as loud as a firecracker, is refered to as the pain threshold. It's the point where your ear interpert the level of sound as physically painful. Prolonged exposure at this level is very dangerous. The average rock concert is 120 decibels. At that volume hearing damage occurs in 7.5 minutes.