Sources A and B emit long-range radio waves of wavelength 380 m, with the phase of the emission from A ahead of that from source B by
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Sources A and B emit long-range radio waves of wavelength 380 m, with the phase of the emission from A ahead of that from source B by 90°. The distance rA from A to a detector is greater than the corresponding distance rB from B by 140 m. What is the magnitude of the phase difference at the detector?
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