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Question
An LED emits visible light when it’s ______.
Options
Junction is reverse biased.
Depletion region widens.
Holes and electrons recombine.
The junction becomes hot.
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Solution
An LED emits visible light when it’s holes and electrons recombine.
Explanation:
Because of the recombination of electrons and holes, current flow occurs in the PN junction diode and thus the LED emits light.
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