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S1 and S2 are two identical sound source...

`S_1` and `S_2` are two identical sound sources of frequency 656 Hz. The source `S_1`, is located at 0 and `S_2` moves anti-clockwise with a uniform speed 4`sqrt2` `ms^(-1)` on a circular path around O, as shown in the figure. There are three points P, Q and R on this path such that P and R are diametrically opposite while Q is equidistant from them. A sound detector is placed at point P. The source `S_1`, can move along direction OP.
[Given: The speed of sound in air is 324 ms^(-1)]

When only `S_2` is emitting sound and it is at Q, the frequency of sound measured by the detector in Hz is

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