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Two monochromatic sources of electomagne...

Two monochromatic sources of electomagnetic wave, `P` and `Q` emit waves of wavelength `lambda = 20 m` and separted by `5m` as shown. `A,B` and `C` are three points where interference of these waves is observed. If phase of a wave generated by `P` is ahead of wave generated by `Q` by `pi//2` then (given intensity of both waves is `l`) :

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