See the diagram and choices for reference. The questions is, two coherent sources of radio waves emit identical signals of wavelength λ = 2 m in phase with each other as shown. The two sources are 6 m apart. What is the minimum distance between the receiver and source B, r_B, such that the receiver does not detect any signal?

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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.