NEET 2018 If fundamental frquency of Open pipe is Third Hormonic of Closed Pipe @IIT-JEEandNEET

This is a NEET 2018 question and If fundamental frquency of Open pipe is Third Hormonic of Closed Pipe, we need to find lengh of open organ pipe.

0:00 Given problem is...
0:40 fundamental frequency of closed pipe...
2:00 third hormonic frequency of closed pipe...
4:10 First hormonic of open pipe is..
5:10 length of open pipe is...



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