A Very Loud Train Whistle Has an Acoustic Power Output

Multiple Choice

A very loud train whistle has an acoustic power output of 94 W.If the sound energy spreads out spherically,what is the intensity level in dB at a distance of 95 meters from the train? (I₀ = 10−¹² W/m²)

A) 21 dB
B) 69 dB
C) 89 dB
D) 94 dB
E) 205 dB