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Change in the fundamental of a closed pipe when water is poured in

This type of question, asked 2 times: 30 Jan 2024, 4 Apr 2025. All 2 questions below, oldest first.

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  1. Question 1

    30 Jan 2024

    29
    In a closed organ pipe, the frequency of fundamental note is 30 Hz30\text{ }Hz. A certain amount of water is now poured in the organ pipe so that the fundamental frequency is increased to 110 Hz110\text{ }Hz. If the organ pipe has a cross-sectional area of 2 cm22{\text{ }cm}^{2}, the amount of water poured in the organ tube is _______g. (Take speed of sound in air is 330 m/s330\text{ }m/s )

  2. Question 2

    4 Apr 2025

    16
    In an experiment with a closed organ pipe, it is filled with water by (15)\left( \frac{1}{5} \right) th of its volume. The frequency of the fundamental note will change by.

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