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A pipe of length $85\;cm$ is closed from one end. Find the number of possible natural oscillations of air column in the pipe whose frequencies lie below $1250\; Hz$. The velocity of sound in air is $340\; m/s$.

$\begin{array}{1 1}(A)\;6 \\ (B)\;4 \\(C)\;12 \\(D)\;8 \end{array} $

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The velocity of sound in air is $340\; m/s$. is 6
Hence A is the correct answer.
answered Apr 7, 2014 by meena.p

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