Question: In Figure sources A and B emit long-range radio waves of wavelength 400 m, with the phase of the emission from A ahead of that

In Figure sources A and B emit long-range radio waves of wavelength 400 m, with the phase of the emission from A ahead of that from source B by 90o. The distance 14 from A to detector D is greater than the corresponding distance (n by 100 m. What is the phase difference of the waves at D?

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