16:I[8216,["972","static/chunks/972-b28da0de92681928.js","47","static/chunks/47-a7f06e9eda1ac756.js","115","static/chunks/app/%5Bexam%5D/questions/%5Byear%5D/%5Bsubject%5D/%5Bchapter%5D/%5BquestionId%5D/page-7b6f0a12b9cc0206.js"],"BackButton"] 17:I[1553,["972","static/chunks/972-b28da0de92681928.js","47","static/chunks/47-a7f06e9eda1ac756.js","115","static/chunks/app/%5Bexam%5D/questions/%5Byear%5D/%5Bsubject%5D/%5Bchapter%5D/%5BquestionId%5D/page-7b6f0a12b9cc0206.js"],"QuestionViewer"] 15:T4c2,{"@context":"https://schema.org","@type":"Quiz","name":"Mht Cet 2026 Waves PYQ with Solution","url":"https://pyq-test-series-platform-alsjdcxu2-sameers-projects-41c5a71e.vercel.app/mht-cet/questions/2026/physics/waves/jt-mr4ofhav","educationalLevel":"Entrance exam preparation","about":"Mht Cet / Physics / Waves","hasPart":{"@type":"Question","name":"Mht Cet 2026 Waves PYQ with Solution","text":"A pipe open at both ends has a fundamental frequency 'f' in air. The pipe is dipped in water, so that \\dfrac{2}{3}^{rd} length of pipe is in water, Now the fundamental frequency of the air column is","eduQuestionType":"mcq","acceptedAnswer":{"@type":"Answer","text":"B"},"comment":{"@type":"Comment","text":"For the pipe open at both ends, suppose its full length is L. Its fundamental frequency is f=\\frac{v}{2L} where v is the speed of sound in air. Now the pipe is dipped in water so that \\frac{2}{3} of its length is in water. So only the remaining length contains air: L_{\\text{air}}=L-\\frac{2L}{3}=\\frac{L}{3} The water surface acts like a closed end, and the top of the pipe is open. So the air column becomes a pipe closed at one end and open at the other. For a closed pipe, the fundamental frequen..."}}}18:T429,

For the pipe open at both ends, suppose its full length is $L$.

Its fundamental frequency is

$$ f=\frac{v}{2L} $$

where $v$ is the speed of sound in air.

Now the pipe is dipped in water so that $\frac{2}{3}$ of its length is in water. So only the remaining length contains air:

$$ L_{

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