Two coherent point sources A and B have equal frequency and are in phase. An observer moves along the perpendicular bisector of AB. Which statement correctly describes the interference condition experienced by the observer?
Options

Question

Two coherent point sources A and B have equal frequency and are in phase. An observer moves along the perpendicular bisector of AB. Which statement correctly describes the interference condition experienced by the observer?

Options

G1 Physics · Accepted Answer

Every point on the perpendicular bisector is equidistant from A and B. Therefore, PA = PB and Δ = 0. For in-phase sources, zero path difference gives constructive interference. Hence the observer remains on a maximum locus. Correct option: C.