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A stationary horn emits a 135-Hz tone. What frequency is heard by a passenger on a train which is moving towards this horn with a speed of 31.3 m/s?

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F = ((V + Vr) / V) * Fo. V IN m/s.

F = ((343 + 31.3) / 343) * 135 Hz,
F = (374.3 / 343) * 135 = 147.3 Hz.

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