The interatomic distance for a metal is $3 \times {10^{ - 10}}\,m$. If the interatomic force constant is $3.6 \times {10^{ - 9}}\,N/{{\buildrel _{\circ} \over {\mathrm{A}}}}$, then the Young's modulus in $N/{m^2}$ will be
  • A$1.2 \times {10^{11}}$
  • B$4.2 \times {10^{11}}$
  • C$10.8 \times {10^{ - 19}}$
  • D$2.4 \times {10^{10}}$
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