Question

The bulk modulus of a metal is 10^10 N/m^2 and Poisson ratio is 0.20. If average distance between the molecules is 3 angstrom then the interatomic force constant is

Answer 1

Force constant (K) = Young's modulus × interatomic distance

                             ∴ 7 = 3 × 10–10 × Y

                             ∴ Y = (7/3) × 1010 = 2.33 × 1010 (N / m2)  

Answer 2

Answer: K=5.4

Explanation:

You should know the relation between young and bulk modulus {Y=3B(1-2p)}

And Yx=k

We have to find K,

Now using the first fomula me get Y

And putting Y and X=3A we get k