Chapter 14 - Sound - Learning Path Questions and Exercises - Exercises - Page 524: 24

a). $100dB$ b). $60dB$ c). $-30dB$

a). Intensity = $10log\frac{I}{I_{0}} =10log\frac{10^{-2}}{10^{-12}}=100dB$ b). Intensity = $10log\frac{I}{I_{0}}=10log\frac{10^{-6}}{10^{-12}}=60dB$ c). Intensity = $10log\frac{I}{I_{0}}= 10log\frac{10^{-15}}{10^{-12}}=-30dB$