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The intensity of sound made by a jet engine from 100 feet away is 100.5 watts per square meter. Find the decibel level given that [tex]I_0 = 10^{-12}[/tex].

A. 130
B. 125
C. 110
D. 115

Answer :

[tex]\begin{gathered} D=10log(\frac{I}{Io}) \\ \\ D=10log(\frac{10^{0.5}}{10^{\text{ -12}\frac{}{}}}) \\ \\ D=10log(10^{11.5}) \\ D=10(11.5)=115 \end{gathered}[/tex]

The answer would be 115

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