A radio station broadcasts a single frequency wave signal simultaneously from two antenas. These two antennas are along a road X, 1.5km apart, A parallel highway( road Y) running along roar X is 0.4 km away. The road experiences an interference of the two signals. A vehicle is moving at a constant speed of 72km/h on the road Y. It is observed that the antenna of the car receives pulses at a constant frequency of 6.25Hz ( due to constructive interference) since it enters the constructive interference region between the two antennas while it moves on road Y. Calculate the wavelength of the waves used?
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