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A highway truck has two horns A and B. W...

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 in air = 330 m/s)

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