One of the loudest sounds in recent history was that made by the
explosion of Krakatoa on August 26-27, 1883. According to
barometric measurements, the sound had a decibel level of 180 dB at
a distance of 161 km. Assuming the intensity falls off as the
inverse of the distance squared, what was the decibel level on
Rodriguez Island, 4,800 km away? ___dB?