If the interatomic spacing in a steel wire is $3.0\mathring A$ and ${Y_{steel}}$= $20 \times {10^{10}}N/{m^2}$ then force constant is
- A$6 \times {10^{ - 2}}\,N/{\mathring A}$
- B$6 \times {10^{ - 9}}N/{\mathring A}$
- C$4 \times {10^{ - 5}}\,N/{\mathring A}$
- D$6 \times {10^{ - 5}}N/{\mathring A}$
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