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  4. The frequency of fundamental note in an organ pipe is 240 Hz. On blowing air, frequencies 720 Hz and 1200 Hz are heard. This indicates that organ pipe is

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Q. The frequency of fundamental note in an organ pipe is $240\,Hz. $ On blowing air, frequencies $720\,Hz $ and $ 1200\,Hz $ are heard. This indicates that organ pipe is

J & K CETJ & K CET 2008

Solution:

since, $ \frac{720}{1200}=\frac{6}{10}=\frac{3}{5}, $ ie, $ 3:5 $
These odd harmonics are produced only if the pipe is closed at one end.