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A and B are two sources generating sound...

A and B are two sources generating sound waves. A listener is situated at C. The frequency of the source at A is 500Hz. A now moves towards C with a speed 4m/s. The number of beats heard at C is 6. When A moves away from C with speed 4m/s, the number of beats heard at C is 18. The speed of sound is 340m/s. The frequency of the source at B is:

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