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Organ Pipes & Resonance Tube question from NEET 2025

Q32NEET 2025Easy

Organ Pipes & Resonance Tube

A pipe open at both ends has a fundamental frequency ff in air. The pipe is now dipped vertically in a water drum to half of its length. The fundamental frequency of the air column is now equal to:

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Answer: (d)

  1. Open pipe: f=v2Lf = \frac{v}{2L}.
  2. Half in water leaves a closed pipe of length L2\frac{L}{2}: f′=v4(L/2)=v2Lf' = \frac{v}{4(L/2)} = \frac{v}{2L}.
  3. So the answer is (d) ff.
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