An empty vessel is filled partially with water natural frequency

Increase

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Decrease

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Remains unchanged

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Insufficient data

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Solution

The correct option is A Increase
The fundamental frequency of a close ended vessel is given by $v / 4 L$ , where $v =$ velocity and $L =$ length of air column. So, frequency is inversely proportional to the length of air column. If the vessel is partially filled by water, then the length of air column decreases. Hence the frequency will increase.

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

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