And she clapped without even knowing what was going on the stairs..

A hand clap on stage in an amphitheater sends out sound waves that scatter from terraces of width $w = 0.75 m$ . The sound returns to the stage as a periodic series of pulses, one from each terrace; the parade of pulses sounds like a played note. Assuming that all the rays in the figure are horizontal, find the frequency at which the pulses return ,that is, the frequency of the perceived note(in $Hz$ )

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