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9 A train moves towards a stationary observer with a speed 34 m s The...

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9 A train moves towards a stationary observer with a speed 34 m s The train sounds a whistle and its frequency registered by the observer is f If the speed of the train is reduced to 17 m s the frequency registered is If the speed of sound is 1 340 m s then the ratio is 1 18 19 3 2 19 18

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