Q.

A closed organ pipe of length L  is vibrating in fundamental frequency. There are two points A and B in the organ pipe as shown, at a distance AB = L / n. Ratio of maximum pressure variation at point A to point B is 23. Find the value of n. (Neglect end correction)
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answer is 3.

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Detailed Solution

We have y=2A sin kx cos wt
|ΔP|=2BAK cosKx cos wt
|ΔP|A|ΔP|B=1cos(π/2n)=23 hence n=3 

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A closed organ pipe of length L  is vibrating in fundamental frequency. There are two points A and B in the organ pipe as shown, at a distance AB = L / n. Ratio of maximum pressure variation at point A to point B is 23. Find the value of n. (Neglect end correction)