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: 10

Answer

The more powerful system is louder by 2.0 dB (which is hardly noticeable).

Work Step by Step

Compare the two amplifiers using the definition of decibels. $$\Delta \beta=10log\frac{P_1}{P_2}=10 log\frac{120W}{75W}\approx 2.0 dB$$
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