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Waves question

2025 · Q158
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Waves question

2025 · Q158

NEETPhysicsWavesMCQ+4 / −1
 

A pipe open at both ends has a fundamental frequency fff 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:

  1. A
    3f2\frac{3 f}{2}23f​
  2. B
    2f2 f2f
  3. C
    f2\frac{f}{2}2f​
  4. D
    fff
View written solutionFree

Correct answer: D

Fundamental frequency of open pipe (at both ends) $f=\frac{V}{2 L} \ldots$ (i)

NEET 2025 Physics - Waves Question 1 English Explanation 1

Now immersed in water open pipe behaves as closed pipe.

NEET 2025 Physics - Waves Question 1 English Explanation 2

$$\begin{aligned} \& f^{\prime}=\frac{v}{4\left(\frac{L}{2}\right)}=\frac{v}{2 L} \quad\text{..... (ii)}\\ \& f=f^{\prime} \end{aligned}$$

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