Suppose a train sounding its horn is moving at 30.0 m/s in s…
Suppose a train sounding its horn is moving at 30.0 m/s in still air on a day when the speed of sound is 350.0 m/s. As the train passes the platform, on which you stand (moving away from you), you hear it with a frequency of 180 Hz. Which frequency does an observer on the train hear?