The second overtone of an open organ pipe has the same frequency as the first overtone of a closed pipe \(L\) metre long. The length of the open pipe will be

A \(\frac{L}{2}\;m\)
B \(4L\;m\)
C \(L \;m\)
D \(2L\;m\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(2L\;m\)

Step-by-step Solution

Detailed explanation

Second overtone of an open organ pipe \(\text { (Third harmonic) }=3 \times v_{0}^{\prime}=3 \times \frac{v}{2 L^{\prime}}\)

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 the following events that occur in their respective phases of cell cycle and select the correct option :

Column \(I\)	Column \(II\)
(\(a\)) \(G _{1}\) phase	(\(i\)) Cell grows and organelle duplication
(\(b\)) \(S\) phase	(\(ii\)) \(DNA\) replication and chromosome duplication
(\(c\)) \(G _{2}\) phase	(\(iii\)) Cytoplasmic growth
(\(d\)) Metaphase in \(M\)-phase	(\(iv\)) Alignment of chromosomes

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