PHYSICS · Subjective · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics
Problem
A train whistle emits a constant note. Consider these three scenarios:
(1) The train moves directly away from a platform at 12 m/s while the listener stands still on the platform.
(2) The train is at rest while the listener walks directly away from it at 5 m/s.
(3) The train moves directly away from the listener at 10 m/s while the listener simultaneously walks directly away from the train at 3 m/s, both along the same line.
Which scenario results in the lowest observed frequency? Justify your choice in one or two sentences.