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Question
Assertion :A p-n junction with reverse bias can be used as a photo-diode to measure light intensity. Reason: In a reverse bias condition the current is small but is more sensitive to changes in incident light intensity.
Assertion :A p-n junction with reverse bias can be used as a photo-diode to measure light intensity. Reason: In a reverse bias condition the current is small but is more sensitive to changes in incident light intensity.
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
A photodiode is a semiconductor device that converts light into current. The current is generated when photons are absorbed in the photodiode. For this purpose, a p-n junction is reverse biased. When small amount of light falls on it, due to sensitivity to voltage changes in reverse bias, there is sudden change in current detected.
A photodiode is a semiconductor device that converts light into current. The current is generated when photons are absorbed in the photodiode. For this purpose, a p-n junction is reverse biased. When small amount of light falls on it, due to sensitivity to voltage changes in reverse bias, there is sudden change in current detected.
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