Intermediate Algebra: Connecting Concepts through Application

Published by Brooks Cole
ISBN 10: 0-53449-636-9
ISBN 13: 978-0-53449-636-4

Chapter 6 - Logarithmic Functions - 6.6 Solving Logarithmic Equations - 6.6 Exercises - Page 534: 30

Answer

$L(I)=90$ dB

Work Step by Step

$I=10^{-3}$ watts per square meter Putting in the equation: $L(I)=10\log \frac{10^{-3}}{10^{-12}}$ $L(I)=10\log (10^{-3}\times 10^{12})$ $L(I)=10\log10^9$ $L(I)=10\times 9\log10$ $L(I)=90\log10$ $L(I)=90$ dB
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