The two nearest harmonics of a tube closed at one end and open at o...

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The two nearest harmonics of a tube closed at one end and open at other end are \( 220 \mathrm{~Hz} \) and \( 260 \mathrm{~Hz} \). What is the fundamental frequency of the system?
(A) \( 20 \mathrm{~Hz} \)
(B) \( 30 \mathrm{~Hz} \)
(C) \( 40 \mathrm{~Hz} \)
(D) \( 10 \mathrm{~Hz} \)
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