Assertion (A): When diode is used as a rectifier, its specified reverse breakdown voltage should not be exceeded.
Reason (R ): When p-n junction diode crosses the reverse break down voltage, it get destroyed.

Options

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is NOT the correct explanation of A
C. A is true but R is false
D. A is false and R is true

Explanation

To solve the question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states that when a diode is used as a rectifier, its specified reverse breakdown voltage should not be exceeded.
- A diode allows current to flow in one direction (forward bias) and blocks it in the opposite direction (reverse bias). However, if the reverse voltage exceeds a certain threshold (the breakdown voltage), the diode can start conducting in reverse, which can lead to damage.

2. **Understanding the Reason (R)**:
- The reason states that when a p-n junction diode crosses the reverse breakdown voltage, it gets destroyed.
- This is true because, during reverse bias, if the breakdown voltage is exceeded, the diode can conduct a very large current (theoretically infinite) which can lead to overheating and permanent damage to the diode.

3. **Evaluating the Truth of Assertion and Reason**:
- Both the assertion and the reason are correct. The assertion correctly identifies the importance of not exceeding the breakdown voltage when using a diode as a rectifier, and the reason accurately explains the consequence of exceeding this voltage.

4. **Conclusion**:
- Since both the assertion and reason are true, and the reason provides a valid explanation for the assertion, we conclude that:
- **Assertion (A) is true.**
- **Reason (R) is true.**
- **Reason (R) is the correct explanation for Assertion (A).**

### Final Answer:
Both Assertion (A) and Reason (R) are true, and the reason is the correct explanation of the assertion.

---