Chapter 3 - Section 3.2 - Exponential Functions - Exercise Set - Page 465: 118

$65.05$ decibels

We need to plug in the intensity level as given in the statement into the formula for decibels. We have $10 \log [(10^{12}) (3.2 \times 10^{-6})]$ Re-written as: $10 \log (3.2 \times 10^{6})$ Now, use a calculator to find the logarithmic value. So, we have $ 10 \log (3.2 \times 10^{6}) \approx 65.05$ decibels Our result is: $65.05$ decibels