If Young's modulus of iron be 2 x $10^{11}$ N/m $^{- 2}$ and interatomic distance be 3 x 10 $^{- 10}$ m, the interatomic force constant will be :

60 N / m

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120 N / m

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30 N / m

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180 N / m

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Solution

The correct option is A $60 N / m$
Interatomic force constant
$= Y \times i n t e r a t o m i c d i s t a n c e$
$= 2 \times 10^{11} \times 3 \times 10^{- 10}$
$= 60 N / m$

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