The Young's modulus of a wire is $y$. If the energy per unit volume is $E$, then the strain will be
A$\sqrt {\frac{{2E}}{y}} $
B$E\sqrt {2y} $
C$Ey$
D$\frac{E}{y}$
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A$\sqrt {\frac{{2E}}{y}} $
a $E = \frac{1}{2}\,y\,{{\rm{(strain)}}^2}$
strain $ = \sqrt {\frac{{2E}}{y}} $
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