Question: Two antennas located at points A and B are broadcasting radio waves of frequency 9 9 MHz . The signals start in phase with each

Two antennas located at points A and B are broadcasting radio waves of frequency 99MHz. The signals start in phase with each other. The two antennas are separated by a distance d=11.9m. An observer is located at point P on the x axis, a distance x=101m from antenna A. The points A, P and B form a right triangle. Now observer P walks along the x axis toward antenna A. What is P's distance from A when they first observe fully constructive interference between the two waves?

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