Poisson's ratio is “the ratio of transverse contraction strain to longitudinal extension strain in the direction of the  ”?

If Young's modulus of elasticity Y for a material is one and half times its rigidity coefficient $\eta ,$ the Poisson's ratio $\sigma$ will be

Given the following values for an elastic material: Young's $\mathrm{m}\mathrm{o}\mathrm{d}\mathrm{u}\mathrm{l}\mathrm{u}\mathrm{s}=7\times {10}^{10}\mathrm{ }{\mathrm{N}\mathrm{m}}^{-2}$ and $\mathrm{B}\mathrm{u}\mathrm{l}\mathrm{k}\mathrm{ }\mathrm{m}\mathrm{o}\mathrm{d}\mathrm{u}\mathrm{l}\mathrm{u}\mathrm{s}=11\times {10}^{10}\mathrm{ }{\mathrm{N}\mathrm{m}}^{-2}$. The Poisson's ratio of the material is -