Solve this following


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 $340 \mathrm{~m} / \mathrm{s}$.


  1. 6

  2. 4

  3. 12

  4. 8

Correct Option: 1


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