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A sound wave having a frequency of 288 Hz travels through air at 20 °C. The decibel
level at a distance of 33.5 m from the source is measured to be 76.8 dB. What is the
dB level at a position that is 16.3 m closer? Assume the density of air is 1.20 kg/m³
and that the source produces spherical wave fronts.
82.59

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