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Two coherenet source of sound S(1) and...

Two coherenet source of sound `S_(1)` and `S_(2)` produce sound waves of the same wavelength `lambda = 1` m , in phase , `S_(1)` and `S_(2)` are placed 1.5 m a part ( see fig). A listener , loacted at L , directly in fornt of `S_(2)` finds that the intensity is at a minimum when he is 2 m away form `S_(2) `. The listener moves aways form `S_(1)` keeping his distance for `S_(2)` fixed . The adjacent maximum of inesity is observed when the listener is at a distane d from `S_(1)` . Then d is

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