The transmitters emit the same 120 kHz signal as before, and the signals overlap when they reach the mobile receiver but ... After traveling an unknown distance, d1, one signal arrives at the receiver while the other bounces off a skyscraper. The signal that bounced off the skyscraper then travels an additional distance, d2, to the receiver as shown in the figure. If the signals started out in phase what minimum value of d2 gives constructive interference?

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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.