Assertion : Photodiode and solar cell work on same mechanism.
Reason : Area is large for solar cell.

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.

Answer

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

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Photodiode and solar cell work on the same mechanism."
- Both photodiodes and solar cells operate based on the photovoltaic effect, where light energy is converted into electrical energy. When light photons hit the semiconductor material, they can excite electrons, generating a flow of current.

2. **Understanding the Reason**:
- The reason states that "Area is larger for solar cell."
- Solar cells typically have a larger surface area compared to photodiodes. This larger area allows solar cells to capture more sunlight, making them more efficient for energy generation.

3. **Evaluating the Truth of the Statements**:
- **Assertion**: True. Both devices operate on the same principle of converting light energy into electrical energy.
- **Reason**: True. The area of a solar cell is indeed larger than that of a photodiode.

4. **Determining the Relationship**:
- While both the assertion and reason are true, the reason provided does not explain why the assertion is true. The area of the solar cell does not influence the fundamental mechanism by which both devices operate. The mechanism is based on the photovoltaic effect, which is independent of the area.

5. **Conclusion**:
- Therefore, the correct answer is that both the assertion and reason are true, but the reason is not the correct explanation for the assertion.

### Final Answer:
Both assertion and reason are true, but the reason is not the correct explanation of the assertion.

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