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Doppler effect: Wavefront diagrams and word problems

Problem

A speaker at rest plays a sound with constant frequency f, start subscript, 0, end subscript near a straight train track. Train A moves toward the speaker, and train B moves away from the speaker.
How does the frequency, f, start subscript, A, end subscript, observed by a rider on train A compare to the frequency, f, start subscript, B, end subscript, observed by a rider on train B?
Choose 1 answer:
Choose 1 answer:
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