Pathfinder Ray and Wave Optics MCQ 10

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In a middle of a calm lake, a radio receiver is installed on a pole at a height 4.0 m above water level. The receiver is used to track radio signals from a satellite orbiting the earth. As the satellite rises above the horizon, intensity of the signals at the receiver varies periodically. It is maximum, when the satellite is 3 degree above the horizon and then again when the satellite is 6 degree above the horizon. Wavelength of the satellite signals is closest to