In the operation of an empty bottle acting as a Helmholtz resonator, how is acoustic energy exchanged?
Answer
Between air pressure stored in the main volume and the kinetic energy of the air moving in and out of the neck.
In an acoustic resonator like a bottle, the energy oscillates in a perfectly timed exchange between being stored as pressure within the air volume and being stored as the kinetic energy associated with the movement (flow) of air through the neck.
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