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MHT CET 2026 (13 May, Shift 1) · Organ Pipes & Resonance Tube

Organ Pipes & Resonance Tube question from MHT CET 2026 (13 May, Shift 1)

Q20MHT CET 2026 · 13 MAY · SHIFT 1Medium

Organ Pipes & Resonance Tube

The fundamental frequency of a closed pipe is $400$ Hz. If ${\frac{1}{3}}^{rd}$ pipe is filled with water then the frequency of $3^{rd}$ harmonic of the pipe will be (Neglect end correction)

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Answer: (b)

Closed pipe: $n_0 = \frac{v}{4L} = 400$ Hz.
With $\frac{1}{3}$ filled, air column $= \frac{2L}{3}$ , so new fundamental $= 400 \times \frac{3}{2} = 600$ Hz.
3rd harmonic $= 3 \times 600 = 1800$ Hz
So the answer is (b) 1800 Hz.

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