Question: A passenger on a train approaching a station at 2 1 m s hears a bell ringing in the station. Take the speed of sound

A passenger on a train approaching a station at 21ms hears a bell ringing in the station. Take the speed of sound to be 343ms.
The passenger hears the bell at a frequency of 305 Hz . What frequency, in hertz, do the people waiting on the station platform hear?
A passenger on a train approaching a station at 2

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