(Answered) A passenger on a train hears a sound with a frequency of

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A passenger on a train hears a sound with a frequency of 496 Hertz as the train approaches a bell on a trackside safety gate. The bell is actually emitting sound with a frequency of 455 Hertz. What frequency (in Hertz) will the passenger hear after passing the bell? (The speed of the sound is 351 m/s.)

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