Q- A riverside warehouse has two open doors and its walls are lined with sound absorbing material. A boat on the river sounds its horn. To a person A on the perpendicular bisector of the doors, at a distance 150 m from the doors, sound is loud and clear while to a person B, 30 m sideways from A, the sound is barely audible. Assuming the person B is at the position of the first minimum, determine the distance between the doors, center to center, if the principle wavelength of the sound wave is 3.00 m.
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