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  4. An empty vessel is partially filled with water. The frequency of vibration of air column in the vessel

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Q. An empty vessel is partially filled with water. The frequency of vibration of air column in the vessel

Waves

Solution:

Frequency of a closed-pipe is
$v=\frac{(2 n+1) c}{4 l}$
When water is filled, the effective $l$ decreases,
hence $v$ increases.