The mean distance between the atoms of iron is $3 \times 10^{-10} \ m$ and the interatomic force constant for iron is $7 \ N/m$. The Young's modulus of elasticity for iron is:
- A$2.33 \times 10^5 \ N/m^2$
- B$23.3 \times 10^{10} \ N/m^2$
- C$233 \times 10^{10} \ N/m^2$
- D$2.33 \times 10^{10} \ N/m^2$
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