What is disturbed at the opening of Helmholtz resonator that bounces like a mass on a spring in simple harmonic motion which creates sound?

What is disturbed at the opening of Helmholtz resonator that bounces like a mass on a spring in simple harmonic motion which creates sound? Correct Answer Air

When the air in the opening of a Helmholtz resonator is disturbed, it bounces like a mass on spring in simple harmonic motion, creating sound. The frequency of the sound created is equal to that of the air’s vibration.
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One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where $$\delta $$ = Deflection of the spring.)
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