The relationship between Young's modulus $Y,$ Bulk modulus $K$ and modulus of rigidity $\eta $ is
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(a)$Y = 3K(1 - 2\sigma ){\rm{ and}}\;Y = 2\eta (1 + \sigma )$
Eliminating $\sigma $ we get $Y = \frac{{9\eta K}}{{\eta + 3K}}$
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