Two antennas located at points A and B are broadcasting radio waves of frequency 102.0 MHz. The signals start in phase with each other. The two antennas are separated by a distance d = 11.8 m. An observer is located at point P on the x axis, a distance x = 95.0 m from antenna A. The points A, P, and B form a right triangle. What is the phase difference between the waves arriving at P from antennas A and B? Enter your answer in radians.

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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.