Physics Waves And Oscillations Level: Misc Level

There is evidence that elephants communicate via infrasound, generating rumbling vocalizations as low as 14 HZ that can travel up to 10km. The intensity level of these sounds can reach 103 dB. measured a distance of 5. 0 0m from the source. Determince the intensity level of the infrasound 10 km from the source, assuming the sound energy radiates uniformly in all directions.