1. The problem statement, all variables and given/known data A. What is the sound intensity of a whisper at a distance of 3.5 m, in W/m^{2}? I know that a whisper is approximately 20 dB and P = 10^{-10} W/m^{2}. B. What is the corresponding sound intensity level in dB? 2. Relevant equations I = Power/[(4pi)(3.5m)^{2}) dB = 10 log (I/I_{o}). 3. The attempt at a solution I = 6.50*10^{-13} dB = -1.87 (I used 10^{-12} W/m^{2} for I_{o})
dB level would depend on how far away you are. You know it's 20 dB at what distance from the whisperer?