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8.Mechanical Properties of Solids
easy
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
$\frac{E}{y}$
Solution
$E = \frac{1}{2}\,y\,{{\rm{(strain)}}^2}$
strain $ = \sqrt {\frac{{2E}}{y}} $
Standard 11
Physics
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