JEE Main 2026 — Waves and Sound Question with Solution
JEE Main 2026 (22 January Shift 2)
Question
In an open organ pipe and are and harmonic frequencies, respectively. If then length of the pipe is mm . (Take velocity of sound in air is .)
Choose an option
Show full solutionCorrect option: C
Correct answer
C225
Step-by-step explanation
For an open organ pipe, the -th harmonic frequency is .
The 3rd harmonic is and the 6th harmonic is .
Taking the difference: .
Solving for : m = 225 mm.
The 3rd harmonic is and the 6th harmonic is .
Taking the difference: .
Solving for : m = 225 mm.
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This is a previous-year question from JEE Main 2026, covering the Waves and Sound chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.