An air column, closed at one end and open at the other, resonates with a tuning fork when the smallest length of the column is 50 cm. The next larger length of the column resonating with the same tuning fork is :

1. 66.7 cm

2. 100 cm

3. 150 cm

4. 200 cm

Doubtly Asked 30 Oct 2026 NEET UG 2016 Phase 1 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 3. 150 cm

Key idea: a closed pipe resonates at odd multiples of \(\lambda/4\): lengths \(L,\,3L,\,5L,\dots\)

Smallest length \(=\lambda/4=50\) cm. The next resonance is at \(3\lambda/4=3\times50=150\) cm.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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