Assertion : Electromagnetic waves exert radiation pressure
Reason : Electromagnetic waves carry energy.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false

Explanation

To solve the question, we need to evaluate the assertion and the reason provided, and determine their truthfulness and relationship.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Electromagnetic waves exert radiation pressure."
- This statement is true. Electromagnetic waves do exert radiation pressure when they interact with surfaces. This happens because they carry momentum, and when they strike a surface, they transfer momentum to it, resulting in a force known as radiation pressure.

2. **Understanding the Reason**:
- The reason states that "Electromagnetic waves carry energy."
- This statement is also true. Electromagnetic waves indeed carry energy, which is a fundamental property of all waves, including electromagnetic waves.

3. **Analyzing the Relationship**:
- The reason given explains why the assertion is true. Since electromagnetic waves carry energy, they can exert pressure when they interact with matter. The transfer of energy and momentum during this interaction results in radiation pressure.
- Therefore, the reason is a correct explanation of the assertion.

4. **Conclusion**:
- Both the assertion and the reason are true, and the reason correctly explains the assertion. Hence, the correct option is that both the assertion and reason are true, and the reason is the correct explanation of the assertion.

### Final Answer:
- The correct answer is Option A: Both assertion and reason are true, and the reason is the correct explanation of the assertion.