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Observer moves towards a stationary source at one fifth the speed of sound: percentage increase in apparent frequency

The same question, asked 3 times: 3 May 2023 S2, 23 Apr 2025 S1, 14 May 2026 S1. Every wording below, oldest first.

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  1. Question 1

    3 May 2023 S2

    35
    An observer moves towards a stationary source of sound with a velocity of one-fifth of the velocity of sound. The percentage increase in the apparent frequency is

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  2. Question 2

    23 Apr 2025 S1

    19
    An observer moves towards a stationary source of sound with a velocity of one fifth of the velocity of sound. The percentage increase in the apparent frequency is

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  3. Question 3

    14 May 2026 S1

    121
    An observer moves towards a stationary source of sound with a velocity (15)th\left(\dfrac{1}{5}\right)^{th} of the velocity of sound. The percentage increase in the apparent frequency is

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