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A and B are two point sources of sound (...

A and B are two point sources of sound (of same frequency) and are kept at a separation. At a point `P`, the intensity of sound is observed to be `I_(0)` when only source A is put on. With only B on the intensity is observed to be `2I_(0)`. The distance `AP` is higher than distance `BP` by half the wavelength of the sound. Find the intensity recorded at `P` with both sources on. Give your answer for following cases:
(a) The sources are coherent and in phase.
(b) The sources are coherent and 180° out of phase.
(c) The sources are incoherent.

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