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 - Problems - Page 354: 12

Answer

134 dB

Work Step by Step

The intensity is only one-quarter as much as it was before. Example 12–4 shows that halving the intensity reduces the sound level by 3 dB. In going from 4 engines to 1, we halve the intensity twice. The sound level for one engine is 140 dB – 3 dB – 3 dB = 134 dB.
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