An open pipe is in resonance in 2 nd harmonic with frequency \( f_{1} \). Now one end of the tub...

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An open pipe is in resonance in 2 nd harmonic with frequency \( f_{1} \). Now one end of the tube is closed and frequency is
P increased to \( f_{2} \) such that the resonance again occurs in \( n \)th

W) harmonic. Choose the correct option. \( \quad(2005,2 \mathrm{M}) \)
(a) \( n=3, f_{2}=(3 / 4) f_{1} \)
(b) \( n=3, f_{2}=(5 / 4) f_{1} \)
(c) \( n=5, f_{2}=\frac{5}{4} f_{1} \)
(d) \( n=5, f_{2}=\frac{3}{4} f_{1} \)
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