# Two points .

The figure shows two point sources $$S_{1}$$ and $$S_{2}$$ that emit sound of wavelength $$\lambda = 2.00 m$$. The emissions are isotropic and in phase, and the separation between the sources is $$d = 16.0 m.$$ At any point P on the x axis, the wave from $$S_{1}$$ and the wave from $$S_{2}$$interfere. When P is very far away $$(x = \infty),$$ what are the phase difference between the arriving waves from $$S_{2}$$ and $$S_{2}$$.

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