Question

The net potential energy Un of a pair of atoms, a distance r apart is Un = Ua +Ur = -A/r^2 + B/r^10

Where the two constants A= 7.2x10^-20 J(nm)^2, B= 9.4x10^-25 J(nm)^10 and 1ev = 1.602x10^-19 J, determine

(a) The eqilibrium interatomic spacing r0

(b) The required force Fmax to separate the two atoms to an infinite distance

(c) The minimum potential energy Uo

(d) Plot the variation of net force FN with respect to r

(e) Plot the variation of net potential energy Un with respect to r

Answer 1