Two horns each frequency is 100 Hz fixed at two ends of a 1 m long bar. The bar rotates in an axis perpendicular to the bar at it centre of gravity. The frequency of beats heard by a person who is stay away from the bar is, (The sound velocity of air is 330 m s-1) (1) 4 (2) 6 (3) 8 (4) 10 (5) 12
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