TS EAMCET 03 May 2019 Shift 1 Solved Paper

A highway truck has two horns A and B. When sounded together, the driver records 50 beats in 10 seconds with horn B blowing and the truck moving towards a wall at a speed of 10 m/s, the driver noticed a beat frequency of 5 Hz with the echo. When frequency of A is decreased the beat frequency with two horns sounded together increases. Calculate the frequency of horn A. (Speed of sound = 330 m/s)