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NEET 2025
Exam
NEET
Year
2025
Subject
Physics
Chapter
Waves and Sound

NEET 2025 · Physics · Waves and Sound

A pipe open at both ends has a fundamental frequency f in air. The...

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 :

Options

  1. Af2\frac{f}{2}
  2. Bff
  3. C3f2\frac{3 f}{2}
  4. D2f2 f

Correct answer

B. ff

Step-by-step solution

For open pipe f=V2ℓ\mathrm{f}=\frac{\mathrm{V}}{2 \ell} When half of its length is dipped in water, Now it is COP. f′=V4(ℓ/2)f′=V2ℓf′=f\begin{aligned} & \mathrm{f}^{\prime}=\frac{\mathrm{V}}{4(\ell / 2)} \\ & \mathrm{f}^{\prime}=\frac{\mathrm{V}}{2 \ell} \\ & \mathrm{f}^{\prime}=\mathrm{f}\end{aligned}
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