Intensity Level formula is given by. And V represents sound wave velocity in meters per second. A person whistles with the power of 09 10-4 W.
Multiplying distance by ten subtracts 20 dB.
The speed of sound is 343 meters per second or 1125 feet per second. That means that the distance is two times ten times away Doubling distance subtracts 6 dB from the level. As given in the problem. The speed of sound is 343 meters per second or 1125 feet per second.