Point P is a distance of 8.5 m and 9.5 m from a speaker set.   Both speakers emit identical sound waves with a wavelength of 1.0 m. a) If the waves are being emitted from both speakers in-phase, what kind of interference occurs at point P? b) What if the speakers emit waves out of phase by π radians? What interference would occur at P?

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.