The acoustical system shown in the figure below is driven by a speaker emitting sound of frequency 712 Hz. Sliding section Receiver Speaker (a) If constructive interference occurs at a particular location of the sliding section, by what minimum amount should the slider be moved upward so that the destructive interference occurs instead? (b) What minimum distance from the original position of the sliding section will again result in constructive interference? m

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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.