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    Doppler Effect

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    A train is moving with a speed of 31.8 m/s sounds a 136-Hz horn. (a) What frequency is heard by an observer standing near the tracks? (b) Suppose the stationary observer sounds a horn that is identical to the one on the train. What frequency is heard from this horn by a passenger in the train?

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    (a) If the source is moving towards the stationary detector with a velocity of Vs, the pbserevd ...

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    The expert examines the Doppler Effect.

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