Question

A passenger on a train hears a sound with a frequency of 511 Hertz as the...

A passenger on a train hears a sound with a frequency of 511 Hertz as the train approaches a bell on a trackside safety gate. The bell is actually emitting sound with a frequency of 459 Hertz. What frequency (in Hertz) will the passenger hear after passing the bell? (The speed of the sound is 348 m/s.)

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