Assertion: The photodiode is used to detect the optical signals

Question

Assertion: The photodiode is used to detect the optical signals. These diodes are preferably operated in reverse biased mode

Reason: fractional change in majority carriers produce higher reverse bias current

Smart Achievers · Accepted Answer

(3)

A photodiode is reverse biased. When light falling on it produces charge carriers, the fractional change, in minority carriers is high since the original current is very small.

$T E (2 R) = - \frac{G M m}{4 R}$

$T E (3 R) = - \frac{G M m}{6 R}$

Solution

Q.
Assertion: The photodiode is used to detect the optical signals. These diodes are preferably operated in reverse biased mode

Reason: fractional change in majority carriers produce higher reverse bias current

1 Assertion is True, Reason is True; Reason is a Correct explanation for Assertion

2 Assertion is True, Reason is True; Reason is NOT a Correct explanation for Assertion

3 Assertion is True, Reason is False

4 Assertion is False, Reason is True

Ans.
(3)

A photodiode is reverse biased. When light falling on it produces charge carriers, the fractional change, in minority carriers is high since the original current is very small.

$T E (2 R) = - \frac{G M m}{4 R}$

$T E (3 R) = - \frac{G M m}{6 R}$

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