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A loudspeaker L is placed in the hall with two doors D and D open...

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A loudspeaker L is placed in the hall with two doors D and D open to the playground as shown below The distance between D and D is 74 25 m The loudspeaker L is equidistant from D and D Monotonic sound waves are emitted from the loudspeaker and it is found that at both points P Q sound intensities are minimum Distance of point P from D is 6m The line joining D P and Q is perpendicular to the line joining D and D No other minimum intensity locations can be found between PQ and beyond Q along the PQ line The wavelength in metre of the sound wave generated by the loudspeaker is L Hall D

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