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प्रश्न
An LED emits visible light when it's ______.
पर्याय
Junction is reverse biased.
Depletion region widens.
Holes and electrons recombine.
The junction becomes hot.
उत्तर
An LED emits visible light when its holes and electrons recombine.
Explanation:
Because on recombining of electrons and holes current flow occurs in PN junction diode and thus LED emits light.
संबंधित प्रश्न
Choose the correct option:
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Answer in brief.
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Answer in brief.
On which factors does the wavelength of light emitted by a LED depend?
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Why should a photodiode be operated in reverse biased mode?
Answer in brief.
State the uses of the solar cell.
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Explain the forward and the reverse characteristic of a Zener diode.
Explain the working of a LED.
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State any two advantages and disadvantages of a photodiode.
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With a neat labelled diagram, explain the working of a photodiode. Calculate the wavelength in angstrom at which the emissive power is maximum for a blackbody heated to 3727 °C.
State the factors which control the wavelength of light emitte d by an LED.
Zener breakdown results from breaking of Si-Si covalent bonds in a silicon junction diode due to ______.
Draw a neat labelled schematic diagram of LED.
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Draw Light Emitting Diode circuit symbol.
