College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300



College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

An airplane mechanic notices that the sound from a twin-engine aircraft varies rapidly in loudness when both engines are running. What could be causing this variation from loud to soft?

To determine
The cause of variation of loudness of sound from twin-engine aircraft from loud to soft.


The variation of loudness of sound can be understood from the concepts of beats.

The phenomenon of beats is an interference effect that occurs when two waves with slightly different frequencies combine at a fixed point in space.

The sound waves produced from the air craft engines are in phase at one time causing loud sound and they are out of phase at some other time causing soft sound. This happens because of the air craft engines are running at slightly different frequencies...

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