(Solution) - A railroad train is traveling at 30 0 m s in still -(2025 Original AI-Free Solution)

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A railroad train is traveling at 30.0 m/s in still air. The frequency of the note emitted by the train whistle is 262 Hz. What frequency is heard by a passenger on a train moving in the opposite direction to the first at 18.0 m/s and
(a) Approaching the first; and
(b) Receding from the first?