Answer
$65$ $decibels$
Work Step by Step
$$D(I) = 10\log(10^{12}I)$$ $$D(3.2 \times 10^{-6}) = 10\log(10^{12} (3.2 \times 10^{-6}))$$ $$D(3.2 \times10^{-6}) = 10\log(3.2 \times 10^{6}) \approx 65$$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter 4 - Exponential and Logarithmic Functions - Exercise Set 4.2 - Page 467: 118
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