MHT CET · Physics · Waves and Sound

A closed organ pipe and an open organ pipe have their first overtones identical in
frequency. Their lengths are in the ratio

A \(3: 4\)
B \(2: 3\)
C \(4: 5\)
D \(1: 2\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(3: 4\)

Step-by-step Solution

Detailed explanation

First overtone of a closed pipe is given by
\(
\mathrm{f}=\frac{3 \mathrm{~V}}{4 \ell}
\)
First overtone of an open pipe is given by
\(
\mathrm{f}^{\prime}=\frac{\mathrm{V}}{\ell^{\prime}}
\)
Since \(\mathrm{f}=\mathrm{f}^{\prime}, \quad \frac{3 \mathrm{~V}}{4 \ell}=\frac{\mathrm{V}}{\ell^{\prime}}\)
\(
\therefore \frac{\ell}{\ell^{\prime}}=\frac{3}{4}
\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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A closed organ pipe and an open organ pipe have their first overtones identical infrequency. Their lengths are in the ratio

Step-by-step Solution

A closed organ pipe and an open organ pipe have their first overtones identical in
frequency. Their lengths are in the ratio