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A spherical point monopole with source strength of 0.1 m3/sec radiate sound waves into air. At a radial distance 'r' from the source the pressure

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A spherical point monopole with source strength of 0.1 m3/sec radiate sound waves into air. At a radial distance 'r' from the source the pressure field and the particle velocity has a phase difference of 30. The acoustic sound intensity at the same location is measured to be 10W/m2. Find the value of 'r' and the frequency of the acoustic waves. _ PI. __..'I'.._.__ _._!I_ _ .I'F...J

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