Consider two trains in a train station, each having a whistle of frequency 392 Hz. Train A is stationary and train B is moving to the right away from A at 35.0 m/s. You are between the two trains and also moving to the right at 15.0 m/s (you’re on a bike). A) What is the frequency of A as heard by you? B) What is the frequency of B as heard by you. C) What is the beat frequency you hear?
