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Question
A LED emits visible white light when its ______
Options
junction is reversed-biased.
depletion layer widens.
holes and electrons recombine.
junction becomes hot.
MCQ
Fill in the Blanks
Solution
A LED emits visible white light when its holes and electrons recombine.
Explanation:
LED is a semi-conductor source of light which emits light when current flows through it. When electrons in semiconductors recombine with electron holes, releasing energy, in the form of photons.
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