Which among the following metals is the most suitable to be used as telecommunication cable?

Options

A. aluminium
B. tin
C. iron
D. copper

Explanation

To determine which metal is the most suitable for use in telecommunication cables, we need to evaluate the conductivity and other properties of the given metals. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Identify the Metals**: The metals we need to evaluate are Aluminium, Tin, Iron, and Copper.

2. **Evaluate Conductivity**:
- **Aluminium**:
- It is a good conductor of electricity.
- However, it reacts with air and moisture to form aluminium oxide, which is electrically resistant. This means that while it can conduct electricity, its effectiveness is reduced due to the formation of this oxide layer.
- **Tin**:
- Tin is not a good conductor of electricity. It has higher resistivity compared to other metals, making it less suitable for telecommunication cables.
- **Iron**:
- Iron also has high resistivity and is not a good conductor of electricity. It is not suitable for telecommunication cables for the same reason as tin.
- **Copper**:
- Copper is an excellent conductor of electricity. It has low resistivity and does not react with air and moisture in a way that would significantly hinder its conductivity. Additionally, copper has good strength, making it durable for use in cables.

3. **Conclusion**:
- Based on the evaluations, Copper is the most suitable metal for telecommunication cables due to its excellent conductivity, low resistivity, and strength.

### Final Answer:
**Copper** is the most suitable metal to be used as telecommunication cable.

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