An empty vessel is partially filled with water, then the frequency of vibration of air column in the vessel
A
Remains same
B
Decreases
C
Increases
D
First increases then decreases
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C
Increases
c (c)For closed pipe in general $n = \frac{v}{{4l}}(2N - 1)$==> $n \propto \frac{1}{l}$
i.e. if length of air column decreases frequency increases.
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