Answer
$2\times10^{-5}W/m^{2}$
Work Step by Step
$60=10log\frac{I}{10^{-12}}$
So, $I=10^{-6}$
This is the intensity of 1 person.
If all 20 people talk together,
net intensity = $20\times10^{-6} W/m^{2}=2\times10^{-5}W/m^{2}$
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
Published by
Pearson
ISBN 10:
0-32160-183-1
ISBN 13:
978-0-32160-183-4
Chapter 14 - Sound - Learning Path Questions and Exercises - Exercises - Page 524: 31
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