A police siren produces a sound whose frequency range from 635Hz to 912Hz. When the police car is 220 meters from from the scene of an accident, the sirens blare at 75dB. How many decibels higher will the sound intensity be when the police car is 55m away?
The sound intensity = A^2*f^2, but I'm not sure if I am missing something there.
The Attempt at a Solution
If that equation is right, then I'd use ((220^2)(f^2))-((55^2)(f^2)); I'm stuck after that