the question is there is evidence that elephants communicate via infrasoundgener

Question

the question is
there is evidence that elephants communicate via infrasoundgenerating rumbling vocalizations as low as 14Hz that can travel upto 10km. the intensity of these sounds can reach 103dB, measured adistance of 5m from the source. determine the intensity level ofthe infrasound 10km from the source, assuming the sound energyradiates uniformly in all directions.
there is evidence that elephants communicate via infrasoundgenerating rumbling vocalizations as low as 14Hz that can travel upto 10km. the intensity of these sounds can reach 103dB, measured adistance of 5m from the source. determine the intensity level ofthe infrasound 10km from the source, assuming the sound energyradiates uniformly in all directions.

Explanation / Answer

The intensity is inversely prop to distance squared so .     intensity at 10 km / intensity at 5 m =    (5 / 10000)2  =    5 x 10-8 .    then the difference in intensity level is givenby .     = 10  log ( ratio of intensities) = 10 log (5 x10-8) = .            =     -73.0 dB .        So the intensity level at10 km is     103.0 - 73.0   =     30.0dB .    then the difference in intensity level is givenby .     = 10  log ( ratio of intensities) = 10 log (5 x10-8) = .            =     -73.0 dB .        So the intensity level at10 km is     103.0 - 73.0   =     30.0dB

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