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A underpass at the entrance to UCLS is a 9 m long tunnel, open at both...

A underpass at the entrance to UCLS is a 9 m long tunnel, open at both ends. With a speed of sound at 343 m/s, what are the fundamental and first overtone resonant frequencies?

I was able to get it till 343/2(9)

Is this the correct way?

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In this question we have to find the fundamental and first overtone frequency in both ends open organ pipe.

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