Explanation
where σ is Poisson's ratio.
Given that,
Length of rubber band, l=8\,cm
Density, d=1.5\,Kg/{{m}^{3}}
Young’s modulus, Y=5\times {{10}^{8}}\,N/{{m}^{2}}
The relation for increase in length and young’s modulus is as follows:
l=\dfrac{{{L}^{2}}dg}{2Y}
l=\dfrac{{{(8\times {{10}^{-2}})}^{2}}1.5\times 10}{2\times 5\times {{10}^{8}}}
l=\dfrac{64\times {{10}^{-4}}\times 1.5\times 10}{{{10}^{9}}}
l=96\times {{10}^{-12}}
l=9.6\times {{10}^{-11}}\,m
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