[latex]L_1=10cdot hbox{log}_{10}frac{I_1}{I_0}=45\ L_2=10cdot hbox{log}_{10}frac{I_2}{I_0}=48\ L_3=10cdot hbox{log}_{10}frac{I_3}{I_0}=50\\ hbox{log}_{10}frac{I_1}{I_0}=4,5\ hbox{log}_{10}frac{I_2}{I_0}=4,8\ hbox{log}_{10}frac{I_3}{I_0}=5\\ 10^{4,5}=frac{I_1}{I_0}\ 10^{4,8}=frac{I_2}{I_0}\ 10^{5}=frac{I_3}{I_0}\\ I_1=I_0cdot 10^{4,5}\ I_2=I_0cdot 10^{4,8}\ I_3=I_0cdot 10^{5}\ [/latex] Całkowite natężenie dźwięku wynosi : [latex]I=I_1+I_2+I_3=I_0cdot (10^{4,5}+10^{4,8}+10^{5})=\\=10^{-12}cdot (10^{4,5}+10^{4,8}+10^{5})frac{W}{m^2}approx 1,95cdot 10^{-7}frac{W}{m^2}[/latex] Poziom natężenia dźwięku wynosi : [latex]L=10cdot hbox{log}_{10}frac{I}{I_0}=10cdot hbox{log}_{10}frac{I_0cdot (10^{4,5}+10^{4,8}+10^{5})}{I_0}approx\\approx10cdot hbox{log}_{10}10^{5,3}=53 dB[/latex]
