The energy required to create a lattice vacancy in a crystal is equal to 1 ev. the ratio of the number densities of vacancies n(1200 k)/n(300 k) when the crysta

The energy required to create a lattice vacancy in a crystal is equal to 1 eV. The ratio of the number densities of vacancies n(1200 K)/n(300 K) when the crystal is at equilibrium at 1200 K and 300 K, respectively, is approximately Q9 (a) exp(-30) (b) exp(-15) (c) exp(15) (d) exp(30) plzz show the calculation part also of this question