Why amorphous solids isotropic in nature and crystalline solids anisotropic in nature?
In amorphous solids the arrangement of particles is irregular in all directions hence the value of any physical property is same along any direction. Hence they are isotropic in nature.
Whereas in crystalline solids the arrangement of constituent particles are regular and have repeated similar arrangement. But the unit cell will have different arrangement of atoms in X, Y, and Z planes. Hence, they are anisotropic in nature.