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A train traveling at 130 (km/hr) toward an observer at an angle 20 from the line of sight. It gives out a 800 (Hz)

A train traveling at 130 (km/hr) toward an observer at an angle 20 from the line of sight. It gives out a 800 (Hz) whistle. What is the frequency perceived by the observer? (The velocity of sound is approximately 340 m/s.)

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