NEET · Physics · STD 11 - 14. waves and sound

Two open organ pipes of fundamental frequencies \(n_{1}\) and \(n_{2}\) are joined in series. The fundamental frequecny of the new pipe so obtained will be

A \(\frac{{{n_1} + {n_2}}}{2}\)
B \(\sqrt {{n_1}^2 + {n_2}^2} \)
C \(\;\frac{{{n_1}{n_2}}}{{{n_1} + {n_2}}}\)
D \(\;({n_1} + n_2)\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(\;\frac{{{n_1}{n_2}}}{{{n_1} + {n_2}}}\)

Step-by-step Solution

Detailed explanation

Fundamental frequency of an open pipe of length \(L\) is given by \(n =\frac{ v }{2 L }\) \(\Longrightarrow L =\frac{ v }{2 n }\) So, we get lengths of two open pipes as \(L _{1}=\frac{ v }{2 n _{1}}\) and \(L _{2}=\frac{ v }{2 n _{2}}\) Now the pipes are join in series.

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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Match List I with List II :

List I	List-II
(A) Young's Modulus	(I) \(\frac{\Delta d}{\Delta L}\left(\frac{L}{d}\right)\)
(B) Compressibility	(II) \(\frac{F L}{A(\Delta L)}\)
(C) Bulk Modulus	(III) \(-\frac{1}{\Delta P}\left(\frac{\Delta V}{V}\right)\)
(D) Poisson's Ratio	(IV) \(-P\left(\frac{V}{\Delta V}\right)\)

Choose the correct answer from the options given below:

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