A pipe of length \( 85 \mathrm{~cm} \) is closed from one end. Find the number of possible natur...

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A pipe of length \( 85 \mathrm{~cm} \) is closed from one end. Find the number of possible natural oscillations of air column in the pipe whose frequencies lie below \( 1250 \mathrm{~Hz} \). The velocity of sound in air is \( 340 \mathrm{~ms}^{-1} \).
(a) 12
(b) 8
(c) 6
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