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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

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120 N/m

30 N/m

180 N/m

60 N/m

answer is A.

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Detailed Solution

Interatomic force constant $K = Y \times r_{0}$

$= 2 \times 10^{11} \times 3 \times 10^{- 10} = 60 N / m$

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