How is it possible to detect the filling of a bottle under a water tap by hearing the sound at a distance?

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How is it possible to detect the filling of a bottle under a water tap by hearing the sound at a distance?

As the water level in a bottle held under a water faucet rises, the length of the air column reduces. As a result, the frequency of sound generated rises. As a result, hearing sound from a distance can provide information about the water level in the bottle.

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