Suppose that two coherent, spherical sound sources, 1 and 2 , each generate the same amount of power \(P\). The distance between the sources is \(2 \lambda\). Point \(\mathrm{R}\) is on a line of maximum destructive interference, and the distance between \(R\) and source 1 is equal to \(9 \lambda\). Point \(Q\) is on a line of maximum constructive interference, and the distance between Q and source 1 is \(6 \lambda\). Obtain expressions for the intensity at points \(\mathrm{R}\) and \(\mathrm{Q}\).