Amorphous solids :

Options

A. (a) do not have sharp melting points .
B. (b) are isotrophic
C. (c) have same physical properties in all direction
D. (d) are supercooled liquids

Answer

### Step-by-Step Solution

1. **Understanding Amorphous Solids**:
- Amorphous solids are materials that lack a long-range order in their atomic arrangement. Unlike crystalline solids, they do not have a defined geometric structure.

2. **Classification of Solids**:
- Solids can be classified into two main categories:
- **True Solids (Crystalline Solids)**: These have a well-defined structure and properties.
- **Amorphous Solids (Pseudosolids)**: These lack a regular arrangement of atoms.

3. **Properties of Amorphous Solids**:
- **Melting Point**:
- True solids have a sharp melting point, meaning they melt at a specific temperature.
- Amorphous solids do not have a sharp melting point; instead, they have a range of temperatures over which they soften and eventually melt.

- **Surface on Breaking**:
- True solids produce smooth surfaces when broken.
- Amorphous solids produce rough surfaces upon breaking.

- **Anisotropic vs. Isotropic**:
- True solids are anisotropic, meaning their physical properties vary with direction.
- Amorphous solids are isotropic, meaning their physical properties are the same in all directions.

4. **Examples of Amorphous Solids**:
- Common examples include glass and plastics, which are often referred to as supercooled liquids due to their ability to flow over long periods.

5. **Conclusion**:
- Based on the properties discussed, we can conclude that the characteristics of amorphous solids include:
- They do not have sharp melting points.
- They are isotropic.
- They have the same physical properties in all directions.
- They can be considered supercooled liquids.

### Final Answer:
All the properties listed in the options regarding amorphous solids are correct.

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