Physics · Sound Waves

JEE Main 2025 — 4 April, Morning Shift — Question 63

In an experiment with a closed organ pipe, it is filled with water by $\left(\frac{1}{5}\right)$ th of its volume.

The frequency of the fundamental note will change by

Option A:
$-25 \%$
Option B:
$-20 \%$
Option C:
$25 \%$
Correct
Option D:
$20 \%$

Answer: C

Step-by-step solution

$f_{1}=\frac{v}{2 \ell}$

f_{2}=\frac{v}{2\left(\frac{4 \ell}{5}\right)}=\frac{5}{4} f_{1}=1.25 f_{1}

$100 \times \frac{\Delta f}{f}=25 \%$

Solution figure

Answer key and solution verified before publishing.

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Exam: JEE Main 2025
Paper: 4 April, Morning Shift
Subject: Physics
Chapter: Sound Waves
Topic: Vibrations in rod and Air Columns - Organ pipes

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In an experiment with a closed organ pipe, it is filled with water by… | JEE Main 2025 PYQ with Solution · DhiX AI