Given below are two statments : one is labelled as operated in reverse bias condition for light intensity measuremment Reason R : The current in the for ward bias is more than the current in the reverse bias for a p-n junction diode .in the light of the above statement, choose the correct answer from the option below `

Options

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

Answer

To solve the question, we need to analyze the two statements provided:

**Assertion (A):** Photo diodes are preferably operated in the reverse bias condition for light intensity measurement.
**Reason (R):** The current in the forward bias is more than the current in the reverse bias for a p-n junction diode.

### Step-by-Step Solution:

1. **Understanding the Assertion (A):**
- Photo diodes are semiconductor devices that convert light into electrical current.
- They are designed to operate in reverse bias mode when measuring light intensity.
- In reverse bias, the diode is less conductive, which allows it to detect small amounts of light more effectively, as it minimizes the dark current (the current that flows through the diode when no light is present).

**Conclusion:** The assertion is true.

2. **Understanding the Reason (R):**
- In a p-n junction diode, when it is forward biased, the majority carriers (holes in p-type and electrons in n-type) are pushed towards the junction, allowing a larger current to flow.
- In reverse bias, the majority carriers are pulled away from the junction, resulting in a smaller current, primarily due to minority carriers.
- Thus, it is indeed true that the current in forward bias is greater than in reverse bias.

**Conclusion:** The reason is also true.

3. **Analyzing the Relationship Between A and R:**
- While both statements are true, the reason does not explain why photo diodes are operated in reverse bias for light intensity measurement.
- The reason simply states a fact about the current behavior in forward and reverse bias, but it does not justify the assertion regarding the operation of photo diodes.

### Final Conclusion:
- Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation for Assertion (A).

### Answer:
The correct answer is that both A and R are true, but R is not the correct explanation of A.

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