Question

Direction for Assertion - Reason type questions (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 A: Photodiode are operated in reverse bias \(\mathrm{R}\) : In reverse bias fractional change in minority charge carrier is more (A) a (B) \(b\) (C) c (D) \(\mathrm{d}\)

Short answer

\( \boxed{A} \) If both Assertion and Reason are true and reason is the correct explanation of assertion.

Step-by-step solution

A photodiode is a semiconductor device that converts light into an electrical current. Photodiodes are operated in reverse bias, which means that the voltage applied across the diode is in the opposite direction to the flow of the majority charge carriers. This voltage helps the photodiode to better detect and respond to incident light. #Step 2: Understanding Minority Charge Carriers and Reverse Bias#

In a reverse-biased junction, the electric field is enhanced, and the flow of minority carriers increases significantly. This behavior leads to an increase in the sensitivity of the photodiode to detect and generate current under the presence of light. #Step 3: Evaluating the Assertion and Reason#

The assertion (A) states that photodiodes are operated in reverse bias, which is true since the photodiode operates with enhanced sensitivity under reverse bias. The reason (R) states that in reverse bias, the fractional change in minority charge carrier is more. This is also true because the electric field is increased, and the flow of minority carriers significantly contributes to generating current in the presence of light. #Step 4: Determining the relationship between the Assertion and Reason#

Since both the Assertion and Reason are true, and the Reason provides a correct explanation for why photodiodes are operated in reverse bias, we can determine that the correct option for this problem is: (A) If both Assertion and Reason are true and reason is the correct explanation of assertion.