Intensitas dan Taraf Intensitas
Intensitas bunyi
\(I = \dfrac {P}{A}\) ... W/m²
P = daya sumber bunyi ... Watt
A = luas permukaan = 4 π R²
Perbandingan Intensitas bunyi
\(\dfrac {I_1}{I_2} = \left( \dfrac {R_2}{R_1} \right)^2\)
Taraf Intensitas bunyi
\(TI = 10 \:.\: \log \left (\dfrac {I}{I_o} \right)\) ... dB
Io = intensitas ambang bunyi = 10−12
Taraf Intensitas n buah sumber bunyi
\(TI_n = TI_1 +\log n \)
Taraf Intensitas pada jarak tertentu
\(TI_2 = TI_1 +\log \left( \dfrac {R_1}{R_2} \right)^2 \)