Chronology | Current Month | Current Thread | Current Date |
[Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
It says the "background" sound level in a room is 40 dB. With 100 people
talking, it rises to 60 dB. What's the sound level when 55 people leave?