Question

Which among the following will show anisotropy?
A. Glass
B. Plastic
C. Barium chloride
D. Wood

Answer 1

We need to know that anisotropy and isotropy are two opposite terms. We need to know that the Anisotropy can also be defined as a difference when measured along the different axes with respect to the material’s physical or mechanical properties such as absorbance, refractive index, conductivity, tensile strength, etc. If we talk about materials, then materials have different structures. Anisotropy in material is defined by its directional dependence of the material of a physical property.

Complete step by step answer:
We have to remember that anisotropy is a distinct property which is seen in crystalline solids. For crystalline material anisotropy is associated with the crystal symmetry. Though crystals follow an orderly structure, it exhibits a uniform structure composition. Hence, any process done on any point of the crystal will exhibit the same property. The property will not change at any point.
In the given options to the question we have four different materials – glass, plastic, barium chloride and wood.
As we know that the glass and plastic which is a polymer is amorphous in nature, that is it is isotropic. Polymers contain a high amount of macromolecules which is the reason for them being isotropic. Therefore, the option A and B are incorrect.
In wood, we can see lines in one direction. This direction is referred to as with the grain. The wood is stronger with the grain than against the direction of grain. Here, it is clearly visible that the strength of the wood is dependent on the property of the direction. Hence, wood does not show any crystalline property. Therefore, the option D is incorrect.
Also, barium chloride is an ionic crystal with a symmetric crystalline structure. Hence, it is also anisotropic in nature.
Therefore, the correct answer to the question is option C.

Note:
We have to remember that the isotropy is the property of an element defined in a particular direction or with a certain specific measure and the isotropic material may show the same property in every condition. But anisotropy is the property of a material which allows it to change or assume different properties in different directions.