Chapter 17 - Physics of Solids - 7

Physics Class 12
1. Crystalline solids have ordered structure.

2. The co-hesive force between atoms, molecules or ions of a crystalline solid does not maintain long range order in spite of atomic vibrations.

3. Amorphous solids have regular arrangement of molecules.

4. Polymers form a large group of naturally occurring and synthetic material.

5. The smallest three dimensional structure is called a unit cell.

6. Polythene, ploystrene and Nylon are examples of polymers.

7. No deformation is produced when a body is subjected to external force .

8. In a solid atoms are held about their equilibrium position due to interatomic cohesive forces.

9. Deformation is produced in a unit cell of a crystal when an external force is applied on it.

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