Advertisements
Advertisements
प्रश्न
Choose the correct answer from given options
The wavelength and intensity of light emitted by a LED depend upon
विकल्प
forward bias and energy gap of the semiconductor
energy gap of the semiconductor and reverse bias
energy gap only
forward bias only
उत्तर
The wavelength and intensity of light emitted by an LED depends on both energy gap and bias of the diode. Only when the diode is forward biased, it emits photons. The wavelength of the emitted light depends on the enegy gap of the semiconductor.
Hence, the correct answer is forward bias and energy gap of the semiconductor.
APPEARS IN
संबंधित प्रश्न
Using the necessary circuit diagrams, show how the V-I characteristics of a p-n junction are obtained in
Reverse biasing
How are these characteristics made use of in rectification?
The width of depletion region of p-n junction diode is _______.
(A) 0.5 nm to 1 nm
(B) 5 nm to 10 nm
(C) 50 nm to 500 nm
(D) 500 nm to 1000 nm
Why is zener diode fabricated by heavily doping both p- and n-sides of the junction?
The current in the forward bias is known to be more (~mA) than the current in the reverse bias (~μA). What is the reason, then, to operate the photodiode in reverse bias?
How does a light emitting diode (LED) work? Give two advantages of LED’s over the conventional incandescent lamps.
Write the important considerations which are to be taken into account while fabricating a p-n junction diode to be used as a Light Emitting Diode (LED). What should be the order of band gap of an LED, if it is required to emit light in the visible range? Draw a circuit diagram and explain its action.
Answer the following question.
Draw solar cell V-I characteristics.
Name the device which converts the change in intensity of illumination to change in electric current flowing through it. Plot I-V characteristics of this device for different intensities. State any two applications of this device.
Which one of the following is not the advantage of LED?
How can a photodiode be used to measure light intensity?
