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Figure shows two isotropic point sources of sound, `S_1` and `S_2` The sources emit waves in phase at wavelength 0.50 m, they are separated by D = 2.20 m. If we move a sound detector along a large circle centered at the midpoint between the sources, at how many points do waves arrive at the detector (a) exactly in phase and (b) exactly out of phase?

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(a) 18, (b) 16
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