Answer :

Let the sound waves from the two coherent sources S1 and S2 reach the point P.



Rework





From the figure, we find that:




Path difference between the sound waves reaching point P is given by:






Suppose, for constructive interference, this path difference be made equal to the integral multiple of .
Hence,





Where, n = 0, 1, 2…


θ = 0°, 48.2°, 70.5°and 90° are similar points in other quadrants.


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