If the ratio of the Young's moduli and densities of two rods of different materials are respectively, \(3:2\) and \(3:1\), then the ratio of the velocities of sound in the rods is
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\(v = \sqrt{\frac{Y}{\rho}}\) for sound in solids. Ratio = \(\sqrt{\frac{Y_1/Y_2}{\rho_1/\rho_2}}\).