An open pipe is in resonance in its 2nd harmonic with tuning fork of frequency\[{{f}_{1}}\]. Now it is closed at one end. If the frequency of the tuning fork is increased slowly from \[{{f}_{1}}\] then again a resonance is obtained with a frequency\[{{f}_{2}}\]. If in this case the pipe vibrates \[{{n}^{th}}\] harmonics then [IIT-JEE (Screening) 2005]

\[n=5,\] \[{{f}_{2}}=\frac{3}{4}{{f}_{1}}\]

\[n=3,\] \[{{f}_{2}}=\frac{3}{4}{{f}_{1}}\]

\[n=3,\] \[{{f}_{2}}=\frac{5}{4}{{f}_{1}}\]

\[n=5,\] \[{{f}_{2}}=\frac{3}{4}{{f}_{1}}\]

An open pipe is in resonance in its 2nd harmonic with tuning fork of f

1.	An open pipe is in resonance in its 2nd harmonic with tuning fork of frequency\[{{f}_{1}}\]. Now it is closed at one end. If the frequency of the tuning fork is increased slowly from \[{{f}_{1}}\] then again a resonance is obtained with a frequency\[{{f}_{2}}\]. If in this case the pipe vibrates \[{{n}^{th}}\] harmonics then [IIT-JEE (Screening) 2005]
A.	\[n=3,\] \[{{f}_{2}}=\frac{3}{4}{{f}_{1}}\]
B.	\[n=3,\] \[{{f}_{2}}=\frac{5}{4}{{f}_{1}}\]
C.	7 m/s
D.	\[n=5,\] \[{{f}_{2}}=\frac{3}{4}{{f}_{1}}\]
Answer» D. \[n=5,\] \[{{f}_{2}}=\frac{3}{4}{{f}_{1}}\]

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