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Statement of a problem № 3537

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Two whistles are sounded with frequencies of 548 and 552 cycles/s, respectively. A man directly in the line between them walks towards the lower pitched whistle at 1.5 m/s. Find the beat frequency that he hears. Assume the sound velocity of 330 m/s.

Solution:
Two whistles are sounded with frequencies of 548 and 552 cycles/s, respectively.

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