When two semiconductor of p and n type are brought in to contact, they from a p-n junction which acts like a :-

Options

A. rectifier
B. amplifier
C. oscillator
D. conductor

Answer

To solve the question regarding the behavior of a p-n junction formed by bringing p-type and n-type semiconductors into contact, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding P-N Junction**:
- A p-n junction is formed when a p-type semiconductor (which has an abundance of holes) is brought into contact with an n-type semiconductor (which has an abundance of electrons).

2. **Behavior of P-N Junction**:
- When the p-type and n-type semiconductors come into contact, electrons from the n-side will diffuse into the p-side and recombine with holes, creating a depletion region at the junction. This region is devoid of charge carriers and creates an electric field.

3. **Functionality of P-N Junction**:
- The p-n junction diode allows current to flow in one direction (forward bias) and blocks it in the reverse direction (reverse bias). This property is essential for converting alternating current (AC) to direct current (DC).

4. **Identifying the Correct Option**:
- The question asks what a p-n junction acts like. Among the options provided:
- **Rectifier**: Converts AC to DC.
- **Amplifier**: Increases the amplitude of signals.
- **Oscillator**: Converts DC to AC.
- **Conductor**: Allows current to flow without directionality.
- Since a p-n junction diode primarily converts AC to DC, it acts as a rectifier.

5. **Conclusion**:
- Therefore, the correct answer is that a p-n junction acts like a **rectifier**.

### Final Answer:
A p-n junction acts like a **rectifier**.