iven below are two statements : one is labelled as Assertion A and the other is labelled as Reason RAssertion A: Photodiodes are used in forward bias usually for measuring the light intensity.Reason R: For a p−n junction diode, at applied voltage V the current in the forward bias is more than the current in the reverse bias for |Vz|>±V≥|V0| where V0 is the threshold voltage and Vz is the breakdown voltage.In the light of the above statements, choose the correct answer from the options given below Both A and R are true and R is correct explanation A Both A and R are true but R is NOT the correct explanation AA is false but R is trueA is true but R is false
Question
iven below are two statements : one is labelled as Assertion A and the other is labelled as Reason RAssertion A: Photodiodes are used in forward bias usually for measuring the light intensity.Reason R: For a p−n junction diode, at applied voltage V the current in the forward bias is more than the current in the reverse bias for |Vz|>±V≥|V0| where V0 is the threshold voltage and Vz is the breakdown voltage.In the light of the above statements, choose the correct answer from the options given below Both A and R are true and R is correct explanation A Both A and R are true but R is NOT the correct explanation AA is false but R is trueA is true but R is false
Solution
The correct answer is "A is true but R is false".
Photodiodes are usually used in reverse bias for measuring light intensity, not forward bias as stated in Assertion A. This is because in reverse bias, the current is very sensitive to changes in light intensity.
Reason R is incorrect because it states that the current in forward bias is more than the current in reverse bias for a given voltage range. This is not true. In a p-n junction diode, the current in reverse bias is very small compared to the current in forward bias.
Therefore, Assertion A is true but Reason R is false.
Similar Questions
Which of the following statement is not correct in the case of light emitting diodes?A. It is a heavily doped p-n junction.B. It emits light only when it is forward biased.C. It emits light only when it is reverse biased.D. The energy of the light emitted is equal to or slightly less than the energy gap of the semiconductor used.Choose the correct answer from the options given below :C and DACB
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