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A car approaching a crossing at a speed of 20m/s sounds a horn of frequency of 500hz . When the car is 80m from the crossing. Speed of sound in air is 320m/s An observer is at a distance of 60m from the crossing on a road perpendicular to the direction of motion of car. What frequency is heard by the observer .

500.0Hz550.2Hz526.3Hz520.5Hz
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