کجا جو دادم ....:boxing:
Examples of Sounds Levels
Jet takeoff (200 feet)
120 dBA
Construction Site
110 dBA
Intolerable
Shout (5 feet)
100 dBA
Heavy truck (50 feet)
90 dBA
Very noisy
Urban street
80 dBA
Automobile interior
70 dBA
Noisy
Normal conversation (3 feet)...