Find the number of possible natural frequencies of an air column in an open pipe frequencies of which lie below 1250Hz. The length of the pipe is 85cm. The speed of sound is 340ms−1
A
3
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B
4
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C
5
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D
6
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Solution
The correct option is D6 For open organ pipe, length of the pipe will be multiple of all possible λ/2 (even and odd).mλ/2=L,