sound wave prob 2?

Question

a sound wave radiates from a source in all directions. If the power of the osund source is 200 watts, then the intensity level of the sound wave 100 m from the source is, in dB??

please help, thanks!!

Answer 1

Ok, the same, remember this :

Power = 200 watts

remember : I = Power / 4*pi*r^2

I = 200 / 4*pi*(100)^2

I = 1.6*10^-3 Watts / m^2

Hope that helped