Question

What are the decibels 917m away from a 35.5 W sound source?

Answer 1

I=P/4πR² = 35.5/4π•917² = 3.36•10⁻⁶W/m²

I₀= 10⁻¹² W/m²
Sound level (in dB)
β=(10dB)log(I/I₀) =
=10•log(3.36•10⁻⁶/10⁻¹²) =65.2 dB