Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 12 - Sound - General Problems - Page 357: 72

Answer

23 dB

Work Step by Step

One mosquito emits a sound intensity of $I_o=1\times 10^{-12}W/m^2$. Two hundred mosquitoes would emit a sound intensity 200 times that of one mosquito. $$\beta=10log\frac{I}{I_o}=10 log\frac{200I_o}{I_o}= 23 dB$$
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