A sound wave from a siren has an intensity of 1043 Wm2 at a

A sound wave from a siren has an intensity of 104.3 W/m2 at a certain point, and a second sound wave from a nearby ambulance has an intensity level 11 dB greater than the siren\'s sound wave at the same point. What is the intensity level of the sound wave due to the ambulance?

Solution

The intensity level of the police siren is

  Sound intensity beta = 10 log(I/1x10^-12) ===> beta = 10 log (104.3/1x10^-12) = 140 db
Sound intensity of the siren = 151 dB