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wo trains emit whistles of the same frequency, 420 Hz. Bill is standing next to one of the train at rest, the other is traveling

wo trains emit whistles of the same frequency, 420 Hz. Bill is standing next to one of the train at rest, the other is traveling 100 km/hr away from Bill. What will Bill detect as the beat frequency? (Assume speed of sound is 335 m/s)

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