मराठी

How can a photodiode be used to measure light intensity? - Physics

Advertisements
Advertisements

प्रश्न

How can a photodiode be used to measure light intensity?

टीपा लिहा

उत्तर

More photons are incident on the photodiode as the light's intensity rises. As a result, additional electron-hole pairs are generated. The photocurrent gets stronger. Thus, the photocurrent represents the intensity of the light.

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
2021-2022 (April) Term 2 - Outside Delhi Set 2

व्हिडिओ ट्यूटोरियलVIEW ALL [3]

संबंधित प्रश्‍न

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

 


Sunil and his parents were travelling to their village in their car. On the way his mother noticed some grey coloured panels installed on the roof of a low building. She enquired from Sunil what those panels were and Sunil told his mother that those were solar panels.
(a) What were the values displayed by Sunil and his mother? State one value for each.
(b) In what way would the use of solar panels prove to be very useful?
(c) Name the semiconductor device used in solar panels. Briefly explain with the help of a diagram, how this device works


Draw V − I characteristics of a p-n junction diode. Answer the following questions, giving reasons:

(i) Why is the current under reverse bias almost independent of the applied potential up to a critical voltage?

(ii) Why does the reverse current show a sudden increase at the critical voltage?

Name any semiconductor device which operates under the reverse bias in the breakdown region.


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?


Draw the circuit diagram of an illuminated photodiode in reverse bias. How is photodiode used to measure light intensity?


Explain the formation of depletion layer and potential barrier in a p−n junction.


Choose the correct answer from given options
The wavelength and intensity of light emitted by a LED depend upon


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?


What energy conversion takes place in a solar cell?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×