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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 $340\; m/s$.

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

The velocity of sound in air is $340\; m/s$. is 6
Hence A is the correct answer.