A listener at rest (with respect to the air and the ground) hears a signal of frequency
Chapter 17, Problem 111(choose chapter or problem)
A listener at rest (with respect to the air and the ground) hears a signal of frequency f1 from a source moving toward him with a velocity of 15 m/s, due east. If the listener then moves toward the approaching source with a velocity of 25 m/s, due west, he hears a frequency f2 that differs from f1 by 37 Hz.What is the frequency of the source? (Take the speed of sound in air to be 340 m/s.)
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