The ratio of Young's modulus of the material of two wires is $2 : 3.$ If the same stress is applied on both, then the ratio of elastic energy per unit volume will be
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(a) Energy per unit volume $=$ $\frac{{{{({\rm{stress)}}}^{\rm{2}}}}}{{2Y}}$
$\frac{{{E_1}}}{{{E_2}}} = \frac{{{Y_2}}}{{{Y_1}}}$ (Stress is constant)
$\frac{{{E_1}}}{{{E_2}}} = \frac{3}{2}$
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