Question:
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Photodiodes are preferably operated in 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
In the light of the above statements, choose the correct answer from the options given below:
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Photodiodes are preferably operated in 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
In the light of the above statements, choose the correct answer from the options given below:
Assertion A: Photodiodes are preferably operated in 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
In the light of the above statements, choose the correct answer from the options given below:
Updated On: Nov 21, 2025
- A is true but $R$ is false
- Both $A$ and $R$ are true and $R$ is the correct explanation of $A$
- A is false but $R$ is true
- Both $A$ and $R$ are true but $R$ is $N O T$ the correct explanation of $A$
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The Correct Option is B
Solution and Explanation
Photodiodes are operated in reverse bias because the fractional change in current due to light is easier to detect in reverse bias. While it is true that the forward bias current is greater than the reverse bias current, this is not the reason photodiodes are used in reverse bias.
Thus, \(A\) is true, and \(R\) is also true, but \(R\) is not the correct explanation for \(A\).
Thus, \(A\) is true, and \(R\) is also true, but \(R\) is not the correct explanation for \(A\).
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Concepts Used:
Semiconductors
Semiconductors are a crystalline solid materials, whose electrical conductivity lies between a conductor and an insulator. Semiconductors are mainly used in the manufacturing of electronic devices like capacitors, transistors, diodes, Integrated circuits, etc.
Properties of Semiconductor:
- Semiconductor acts like an insulator at Zero Kelvin. On increasing the temperature, it works as a conductor.
- Due to their exceptional electrical properties, semiconductors can be modified by doping to make semiconductor devices suitable for energy conversion, switches, and amplifiers.
- Lesser power losses.
Uses of Semiconductor:
- Semiconductors are widely used in manufacturing electronics devices like transistors, diodes, sensors, integrated circuits.
- Semiconductors are widely used in all electronic devices, like mobile phones, digital cameras, communication devices, trains, ATMs, etc.