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A monorail approaches a platform at a speed of 50 ms which it blows its whistle. A man standing on the platform hears the whistle with frequency 261 Hz. There is no wind and temperature is chilly 0 °C. What is the observed frequency of the whistle when the train is at rest? (The speed of sound in air at 0°C is 332 ms¹.​)​​

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