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AP EAMCET20228 Jul 2022Morning ShiftPhysicsWaves and SoundActual

An open air pipe of length 80 ~cm has the second harmonic frequency equal to the fundamental frequency of a closed organ air pipe. The length of the closed pipe is

Options

  1. A20 ~cm
  2. B40 ~cm
  3. C60 ~cm
  4. D10 ~cm

Correct answer

A. 20 ~cm

Step-by-step solution

We have ( f ₂ )_ Open = ( f ₂ )_ Closed aligned & 2 V 2 l₀ = V 4 l_ C & 1 80 = 1 4 l_ C [ l₀=80 ~cm ] & l_ C =20 ~cm aligned

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