Advertisements
Advertisements
प्रश्न
What is a Light Emitting Diode?
उत्तर
Light-emitting diodes are specialised semiconductor diodes that emit light of a certain colour when forward biased. The construction of an LED differs from that of a conventional diode. The n-region is more highly doped than the p-region of the p-n junction. The LED p-n junction is housed in a dome-shaped transparent casing to ensure consistent light emission in all directions. Metal electrodes affixed to each side of the p-n junction function as terminals for external connectivity.
They are offered in various colors. LED is constructed to ensure that the emitted light is not absorbed by the substance.
APPEARS IN
संबंधित प्रश्न
Choose the correct option:
A Series resistance is connected in the Zener diode circuit to ______.
An LED emits visible light when it's ______.
Choose the correct option.
Solar cell operates on the principle of ______.
Answer in brief.
On which factors does the wavelength of light emitted by a LED depend?
State the principle of solar cells.
Explain how a Zener diode maintains a constant voltage across a load.
Explain the working of a LED.
Explain the principle of operation of a photodiode.
State any two special-purpose diodes.
State any two advantages and disadvantages of a photodiode.
Define the dark current of the photodiode. What are the advantages and disadvantages of a photodiode?
What will be the current flowing through the 6 kΩ resistor in the circuit shown, where the breakdown voltage of the Zener is 6V?
With forward biased mode, the p-n junction diode ______.
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.
Zener breakdown results from breaking of Si-Si covalent bonds in a silicon junction diode due to ______.
Give the name of the following symbol.
Draw a neat labelled schematic diagram of LED.
Distinguish between light-emitting diode and photo-diode.
What is Avalanche breakdown?
Draw Light Emitting Diode circuit symbol.
