As an empty glass vessel is gradually filled with water, the frequency of the sound produced by blowing across its rim tends to?

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1. As an empty glass vessel is gradually filled with water, the frequency of the sound produced by blowing across its rim tends to?

Increase

Decrease

Stay exactly the same

Become inaudible

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Filling the vessel with water shortens the column of air that can vibrate above the water’s surface. A shorter air column vibrates at a higher frequency.