If Young's modulus of iron is $2 \times {10^{11}}\,N/{m^2}$ and the interatomic spacing between two molecules is $3 \times {10^{ - 10}}$metre, the interatomic force constant is ......... $N/m$
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(a) Interatomic force constant $K = Y \times {r_0}$
$ = 2 \times {10^{11}} \times 3 \times {10^{ - 10}} = 60\;N/m$
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