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Q.

For a certain organ pipe, the first three resonance frequencies are in the ratio of 1:3:5 respectively. If the frequency of fifth harmonic is 405 Hz and the speed of sound in air is 324  ms−1, the length of the organ pipe is ____m 

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answer is 1.

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Detailed Solution

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Since the pipe only has odd harmonics, it is a closed organ pipe
5v4l=40581 4l=v81=32481=4l=1m

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