The sound pressure level measured 25 m from a busy road in the 1 kHz octave band is 72 dB. Estimate the sound power being generated per meter of road in the 1 kHz octave band.
a. 3.16 x 10⁻⁷ W/m
b. 3.16 x 10⁻⁸ W/m
c. 3.16 x 10⁻⁹ W/m
d. 3.16 x 10⁻¹⁰ W/m