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Closed pipe of fundamental 400 Hz has one third of its length filled with water: frequency of a higher harmonic

The same question, asked 2 times: 25 Apr 2025 S1*, 13 May 2026 S1. Every wording below, oldest first.

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  1. Question 1

    25 Apr 2025 S1

    35
    The fundamental frequency of a closed pipe is 400 Hz. If (13)rd\left( \frac{1}{3} \right)^{rd} length of the pipe is filled with water, the frequency of the 2nd 2^{\text{nd~}} harmonic of the pipe will be (Neglect end correction)

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  2. Question 2

    13 May 2026 S1

    121
    The fundamental frequency of a closed pipe is 400400 Hz. If 13rd\dfrac{1}{3}^{rd} pipe is filled with water then the frequency of 3rd3^{rd} harmonic of the pipe will be (Neglect end correction)

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