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CBSE - XII Science - Physics - Semiconductor Electronics
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Asked by abhitailor158
6th March 2019,
5:56 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Three photodiodes D1, D2 and D3 are made of semiconductors having band gaps of 2.5 eV, 2 eV and 3 eV respectively. which of them will not able to detect light of wavelength 600 NM
Asked by vk335548
5th March 2019,
10:32 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Please draw V-I characteristics of LED.
Asked by bjayanta
5th March 2019,
2:35 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Half wave rectifier
Asked by shariefy0007
22nd February 2019,
10:51 PM
CBSE - XII Science - Physics - Semiconductor Electronics
why photodiode should be connected in reverse bias and not in forward bias?
Asked by rohitraman1115
21st November 2018,
4:57 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Q- we find a large current of order m milliampere in forward bias and a small current of order microampere in Reverse bias condition so why we connect photodiode in Reverse bias
Asked by modi72879
16th December 2017,
10:43 AM
CBSE - XII Science - Physics - Semiconductor Electronics
What will be the direction of flow of majority charge carriers in reverse biased p-n junction?
Asked by Satish
6th December 2017,
7:14 AM
CBSE - XII Science - Physics - Semiconductor Electronics
Explain half wave and full wave rectifier.
Asked by pksunilnair
4th December 2017,
9:15 AM
CBSE - XII Science - Physics - Semiconductor Electronics
1. What is the direction of photocurrent genereated in photodiode?
Asked by Prakash
3rd November 2017,
11:47 AM
CBSE - XII Science - Physics - Semiconductor Electronics
Please explain the reasoning for I-V characteristics of solar cell. how is it possible that the voltage is zero and there is corresponding short circuit current ?
Asked by Anirudh
19th August 2017,
6:57 AM
CBSE - XII Science - Physics - Semiconductor Electronics
What is metallised finger contact? Why is it smaller in size? On page 489 NCERT Class XII , it says that the electrons are collected on n side and holes are collected on the p side which are collected by finger contact and back contact respectively. Does that mean it is in reversed biased condition? If so , please explain the reasoning for the reverse biased condition.
Asked by Anirudh
19th August 2017,
6:47 AM
CBSE - XII Science - Physics - Semiconductor Electronics
In case of solar cells why is the p side (300 micro meters) so much more thicker than the n side (0.3 micro meter)? Also why an emf is generated in the case of solar cell.
Asked by Anirudh
19th August 2017,
6:40 AM
CBSE - XII Science - Physics - Semiconductor Electronics
How does an Light emitting diode function? As per a preliminary search on the internet I found
an electron releases energy when it drops from a higher orbital to a lower one. This energy is released in the form of a photon. Free electrons moving across a diode can fall into empty holes from the P-type layer. This involves a drop from the conduction band to a lower orbital, so the electrons release energy in the form of photons.
Is this correct? Why does drop from conduction band to lower orbital mean?
Asked by Anirudh
14th August 2017,
12:40 PM
CBSE - XII Science - Physics - Semiconductor Electronics
What is the direction of drift current and diffusion current? What is the reasoning behind it? Is the direction of current is the direction of flow of electrons or holes?
Asked by Anirudh
14th August 2017,
12:20 PM
CBSE - XII Science - Physics - Semiconductor Electronics
in a semiconductor diode,P -side is earthed and N-side is put at potential of -2v(minus two),the diode shall
dear sir/maam
its will conduct or not ?
Asked by Sharaj
10th April 2017,
4:23 PM
CBSE - XII Science - Physics - Semiconductor Electronics
The dominant mechanisms for motion of charge carriers in forward and reverse biased silicon p-n junctiona are
1. Drift in both forward and reverse bias
2. Diffusion in both forward and reverse bias
3. Diffusion in forward bias and drift in reverse bias
4.Drift in forward bias and diffusion in reverse bias
Please explain reason as well
Asked by rajeshtitu
14th July 2016,
9:09 PM
CBSE - XII Science - Physics - Semiconductor Electronics
How is a Zener diode fabricated? What causes the setting up of high electric field even for small reverse bias voltage across the diode? Describe, with the help of a circuit diagram, the working of Zener diode as a voltage regulator.
Asked by Topperlearning User
10th July 2015,
7:40 AM
CBSE - XII Science - Physics - Semiconductor Electronics
semiconductor diode -i-v charactersticcs in forrward and reverse bias???
Asked by ARUN S
4th March 2015,
4:32 PM
CBSE - XII Science - Physics - Semiconductor Electronics
22. Give reasons for the following:
(i) The Zener diode is fabricated by heavily doping both the p and n sides of the junction
(ii) A photodiode, when used as a detector of optical signals is operated under reverse bias.
(iii) The band gap of the semiconductor used for fabrication of visible LED’s must at least be 1.8 eV.
Section
22. Give reasons for the following:
(i) The Zener diode is fabricated by heavily doping both the p and n sides of the junction
(ii) A photodiode, when used as a detector of optical signals is operated under reverse bias.
(iii) The band gap of the semiconductor used for fabrication of visible LED’s must at least be 1.8 eV.
Section
Asked by Malavika Umesh
19th February 2015,
12:25 AM
CBSE - XII Science - Physics - Semiconductor Electronics
Why photo diode act in reverse biase only?
Asked by Tanya
14th January 2015,
11:53 AM
CBSE - XII Science - Physics - Semiconductor Electronics
Asked by Kim
28th November 2014,
6:50 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Why the centre tap of a centre tapped transformer grounded?
Asked by MANISHA MOHANTY
29th October 2014,
12:32 AM
CBSE - XII Science - Physics - Semiconductor Electronics
The current in the forward bias is know to be more (
mA) than the current in the reverse bias (μA). What is the reason, then, to operate the photodiode in reverse bias?
mA) than the current in the reverse bias (μA). What is the reason, then, to operate the photodiode in reverse bias?
Asked by Topperlearning User
10th July 2014,
10:05 AM
CBSE - XII Science - Physics - Semiconductor Electronics
Draw the circuit diagram of an illuminated photodiode in reverse bias. How is photodiode used to measure light intensity?
Asked by Topperlearning User
19th June 2014,
3:39 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Distinguish between photo current and dark current.
Asked by Topperlearning User
19th June 2014,
2:11 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Name two materials used in constructing solar cell.Give 2 uses of solar cell?
Asked by Topperlearning User
19th June 2014,
2:06 PM
CBSE - XII Science - Physics - Semiconductor Electronics
What is a zener diode? why is it also known as breakdown diode.Name one application of Zener diode.
Asked by Topperlearning User
19th June 2014,
1:54 PM
CBSE - XII Science - Physics - Semiconductor Electronics
The figure below shows the V-I characteristic of a semiconductor diode. (i) Identify the semiconductor diode used. (ii) Draw the circuit diagram to obtain the given characteristic of this device. (iii) Briefly explain how this diode can be used as a voltage regulator.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Explain, with the help of a schematic diagram, the principle and working of a Light Emitting Diode. What criterion is kept in mind while choosing the semiconductor material for such a device? Write any two advantages of Light Emitting Diode over conventional indcandescent lamps.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Explain, with the help of a circuit diagram, the working to a photo-diode. Write briefly how it is used to detect the optical signals. Or Mention the important considerations required 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?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Name the semiconductor device that can be used to regulate an unregulated de power supply. With the help of I-V characteristics of this device, explain its working principle.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Draw the I-V characteristics of a solar cell.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Differentiate between Half-wave rectifier and full- wave rectifier
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Draw the circuit diagram for a full-wave rectifier using a p-n junction diodes. Draw input and output waveforms too.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Name the p-n junction diode which emits spontaneous radiations when forward biased. How do we choose the semiconductor, to be used in these diodes, if the emitted radiation is to be in the visible region?
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Semiconductor Electronics
Show the biasing of a photodiode with the help of a circuit diagram. Draw graphs to show variations in reverse bias currents for different illumination intensities.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Semiconductor Electronics
The output of an unregulated d.c power is to be regulated. Name the device that can be used for this purpose and draw the relevant circuit diagram.
Asked by Topperlearning User
4th June 2014,
1:23 PM
CBSE - XII Science - Physics - Semiconductor Electronics
What is the most common use of photodiode?
Asked by Topperlearning User
4th June 2014,
1:23 PM
