The substances that have intermediate value of resistivity is called?

Options

A. Metals
B. Semi-conductor
C. Insulators
D. Mettaloids

Explanation

To solve the question regarding the substances that have an intermediate value of resistivity, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Resistivity**:
- Resistivity is a measure of how strongly a material opposes the flow of electric current. Different materials have different resistivities.

2. **Classify Materials Based on Resistivity**:
- **Conductors** (like metals) have low resistivity, allowing electric current to flow easily.
- **Insulators** (like rubber or glass) have high resistivity, preventing electric current from flowing.
- **Semiconductors** (like silicon) have resistivity values that fall between conductors and insulators.

3. **Identify the Intermediate Value**:
- Since the question asks for a substance with an intermediate value of resistivity, we need to focus on materials that are neither good conductors nor good insulators.

4. **Analyze the Options**:
- **Metals**: These are good conductors with low resistivity.
- **Semiconductors**: These have resistivity values that are intermediate between conductors and insulators.
- **Insulators**: These have high resistivity.
- **Metalloids**: These can have properties of both metals and non-metals but are not typically classified as having intermediate resistivity in the same context as semiconductors.

5. **Conclusion**:
- Based on the classifications, the substance that has an intermediate value of resistivity is **semiconductors**.

### Final Answer:
The substances that have intermediate value of resistivity are called **semiconductors**.

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