Question: While you are stopped at a railroad crossing, a train approaches at 1 2 . 9 m s . To warn those who might pull

While you are stopped at a railroad crossing, a train approaches at 12.9ms.
To warn those who might pull out in the train's path, the engineer on board sounds the horn, emitting a tone of 300 Hz in all directions. If the speed of sound in air is 338ms, at what frequency (in Hz ) will you hear the horn as the train approaches?
While you are stopped at a railroad crossing, a

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