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?
(2017-Delhi)
a. \( 20 \mathrm{~Hz} \)
b. \( 30 \mathrm{~Hz} \)
c. \( 40 \mathrm{~Hz} \)
d. \( 10 \mathrm{~Hz} \)
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