Giancoli 7th Edition textbook cover
Giancoli's Physics: Principles with Applications, 7th Global Edition

12-1: Characteristics of Sound
12-2: Intensity of Sound; Decibels
12-3: Loudness
12-4: Sources of Sound: Strings and Air Columns
12-5: Quality of Sound, Superposition
12-6: Interference; Beats
12-7: Doppler Effect
12-8: Shock Waves; Sonic Booms

Problem 30
A
l20 Hz=8.6 m, l20 kHz=8.6 mml_{20\textrm{ Hz}} = 8.6 \textrm{ m, } l_{20\textrm{ kHz}} = 8.6 \textrm{ mm}
Giancoli 7th "Global" Edition, Chapter 12, Problem 30 solution video poster
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