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A 72.0-Hz sound wave is barely audible at a sound intensity level of 60.0 dB. The...

A 72.0-Hz sound wave is barely audible at a sound intensity level of 60.0 dB. The density of air at 20.0°C is 1.20 kg/m3. Speed of sound in air at 20.0°C is 343 m/s. What is the displacement amplitude of a 72.0-Hz sound wave?

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