A : Photodiode are operated in reverse bias R : In reverse bias fractional change in minority charge carrier is more

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 

R : In reverse bias fractional change in minority charge carrier is more 

(A) a 

(B) b 

(C) c 

(D) d

Answer 1

The correct option is (A) a.

Explanation:

Photodiodes are operated in reverse bias. During reveres bias, reverse saturation current is due to minority currier is very small. When light is incident, the fractional increase in minority charge carrier concentration is significant and is easily measurable. And this fractional change in minority carrier is more than change in majority carries. Hence both statements are true and reason is correct explanation of assertion.