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Resonance tube with a given end correction: next resonating length after the shortest one

The same question, asked 2 times: 3 May 2023 S2*, 19 Apr 2026 S2. Every wording below, oldest first.

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  1. Question 1

    3 May 2023 S2

    6
    The end correction of resonance tube is 1 cm. If the shortest length resonating with a tuning fork is 15 cm, the next resonating length will be

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  2. Question 2

    19 Apr 2026 S2

    120
    In a resonance tube open at one end, the end correction is 1.11.1 cm. If the shortest length of resonating air column with a tuning fork is 1818 cm, the next resonating length will be

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