Serway & Jewett — Superposition and Standing Waves: Problem 35

The ship in Figure P17.35 travels along a straight line parallel to the shore and a distance \(d = 600\text{ m}\) from it. The ship’s radio receives simultaneous signals of the same frequency from antennas A and B, separated by a distance \(L = 800\text{ m}\). The signals interfere constructively at point C, which is equidistant from A and B. The signal goes through the first minimum at point D, which is directly outward from the shore from point B. Determine the wavelength of the radio waves.