First slide

Stationary waves

Question

An empty vessel is partially filled with water, then the frequency of vibration of air column in the vessel

Easy

A

Remains same
B

Decreases
C

Increases
D

First increases then decreases

Solution

For closed pipe in general $n = \frac{v}{4 l} (2 N - 1) \Rightarrow n \propto \frac{1}{l}$
i.e. if length of air column decreases frequency increases.

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