Physics Exam > Physics Questions > The electrical conductivity of a semiconducto...
Start Learning for Free
The electrical conductivity of a semiconductor increases when electromagnetic radiation of a wavelength shorter than 2480 nm is incident on it. The band gap (in eV) for the semiconductor is?
- a)0.5
- b)0.9
- c)0.7
- d)1.1
Correct answer is option 'A'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
The electrical conductivity of a semiconductor increaseswhen electroma...
Therefore, the correct answer is A.
Most Upvoted Answer
The electrical conductivity of a semiconductor increaseswhen electroma...
To understand why the correct answer is option 'A', let's break down the concept of band gap and its relation to electrical conductivity in a semiconductor.
Band Gap:
In a semiconductor, the energy levels of electrons are organized into bands. The valence band contains electrons that are bound to their respective atoms, and the conduction band contains electrons that have enough energy to move freely throughout the material. The energy gap between the valence band and the conduction band is called the band gap.
Electrical Conductivity:
The electrical conductivity of a material is a measure of its ability to conduct electric current. In a semiconductor, the conductivity is determined by the availability of free electrons in the conduction band.
Effect of Electromagnetic Radiation:
When electromagnetic radiation interacts with a semiconductor, it can transfer energy to the material. This energy can be absorbed by the electrons, promoting them from the valence band to the conduction band. The wavelength of the radiation determines the amount of energy transferred.
Shorter Wavelength, Higher Energy:
According to the electromagnetic spectrum, shorter wavelengths correspond to higher energy photons. Therefore, when electromagnetic radiation with a wavelength shorter than 2480nm (nanometers) is incident on a semiconductor, it provides enough energy to promote electrons across the band gap and into the conduction band.
Increased Electrical Conductivity:
Once the electrons are in the conduction band, they are free to move and contribute to the electrical conductivity of the semiconductor. Therefore, the electrical conductivity of the semiconductor increases when electromagnetic radiation with a wavelength shorter than 2480nm is incident on it.
Conclusion:
In this case, the correct answer is option 'A' (0.5 eV) because a band gap of 0.5 eV corresponds to a wavelength of electromagnetic radiation that is shorter than 2480nm, providing enough energy to promote electrons into the conduction band and increase the electrical conductivity of the semiconductor.
Band Gap:
In a semiconductor, the energy levels of electrons are organized into bands. The valence band contains electrons that are bound to their respective atoms, and the conduction band contains electrons that have enough energy to move freely throughout the material. The energy gap between the valence band and the conduction band is called the band gap.
Electrical Conductivity:
The electrical conductivity of a material is a measure of its ability to conduct electric current. In a semiconductor, the conductivity is determined by the availability of free electrons in the conduction band.
Effect of Electromagnetic Radiation:
When electromagnetic radiation interacts with a semiconductor, it can transfer energy to the material. This energy can be absorbed by the electrons, promoting them from the valence band to the conduction band. The wavelength of the radiation determines the amount of energy transferred.
Shorter Wavelength, Higher Energy:
According to the electromagnetic spectrum, shorter wavelengths correspond to higher energy photons. Therefore, when electromagnetic radiation with a wavelength shorter than 2480nm (nanometers) is incident on a semiconductor, it provides enough energy to promote electrons across the band gap and into the conduction band.
Increased Electrical Conductivity:
Once the electrons are in the conduction band, they are free to move and contribute to the electrical conductivity of the semiconductor. Therefore, the electrical conductivity of the semiconductor increases when electromagnetic radiation with a wavelength shorter than 2480nm is incident on it.
Conclusion:
In this case, the correct answer is option 'A' (0.5 eV) because a band gap of 0.5 eV corresponds to a wavelength of electromagnetic radiation that is shorter than 2480nm, providing enough energy to promote electrons into the conduction band and increase the electrical conductivity of the semiconductor.
Free Test
FREE
| Start Free Test |
Community Answer
The electrical conductivity of a semiconductor increaseswhen electroma...
|
Explore Courses for Physics exam
|
|
Similar Physics Doubts
The electrical conductivity of a semiconductor increaseswhen electromagnetic radiation of a wavelength shorter than2480nmis incident on it. The band gap (ineV) for thesemiconductor is?a)0.5b)0.9c)0.7d)1.1Correct answer is option 'A'. Can you explain this answer?
Question Description
The electrical conductivity of a semiconductor increaseswhen electromagnetic radiation of a wavelength shorter than2480nmis incident on it. The band gap (ineV) for thesemiconductor is?a)0.5b)0.9c)0.7d)1.1Correct answer is option 'A'. Can you explain this answer? for Physics 2024 is part of Physics preparation. The Question and answers have been prepared according to the Physics exam syllabus. Information about The electrical conductivity of a semiconductor increaseswhen electromagnetic radiation of a wavelength shorter than2480nmis incident on it. The band gap (ineV) for thesemiconductor is?a)0.5b)0.9c)0.7d)1.1Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Physics 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The electrical conductivity of a semiconductor increaseswhen electromagnetic radiation of a wavelength shorter than2480nmis incident on it. The band gap (ineV) for thesemiconductor is?a)0.5b)0.9c)0.7d)1.1Correct answer is option 'A'. Can you explain this answer?.
The electrical conductivity of a semiconductor increaseswhen electromagnetic radiation of a wavelength shorter than2480nmis incident on it. The band gap (ineV) for thesemiconductor is?a)0.5b)0.9c)0.7d)1.1Correct answer is option 'A'. Can you explain this answer? for Physics 2024 is part of Physics preparation. The Question and answers have been prepared according to the Physics exam syllabus. Information about The electrical conductivity of a semiconductor increaseswhen electromagnetic radiation of a wavelength shorter than2480nmis incident on it. The band gap (ineV) for thesemiconductor is?a)0.5b)0.9c)0.7d)1.1Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Physics 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The electrical conductivity of a semiconductor increaseswhen electromagnetic radiation of a wavelength shorter than2480nmis incident on it. The band gap (ineV) for thesemiconductor is?a)0.5b)0.9c)0.7d)1.1Correct answer is option 'A'. Can you explain this answer?.
Solutions for The electrical conductivity of a semiconductor increaseswhen electromagnetic radiation of a wavelength shorter than2480nmis incident on it. The band gap (ineV) for thesemiconductor is?a)0.5b)0.9c)0.7d)1.1Correct answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Physics.
Download more important topics, notes, lectures and mock test series for Physics Exam by signing up for free.
Here you can find the meaning of The electrical conductivity of a semiconductor increaseswhen electromagnetic radiation of a wavelength shorter than2480nmis incident on it. The band gap (ineV) for thesemiconductor is?a)0.5b)0.9c)0.7d)1.1Correct answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
The electrical conductivity of a semiconductor increaseswhen electromagnetic radiation of a wavelength shorter than2480nmis incident on it. The band gap (ineV) for thesemiconductor is?a)0.5b)0.9c)0.7d)1.1Correct answer is option 'A'. Can you explain this answer?, a detailed solution for The electrical conductivity of a semiconductor increaseswhen electromagnetic radiation of a wavelength shorter than2480nmis incident on it. The band gap (ineV) for thesemiconductor is?a)0.5b)0.9c)0.7d)1.1Correct answer is option 'A'. Can you explain this answer? has been provided alongside types of The electrical conductivity of a semiconductor increaseswhen electromagnetic radiation of a wavelength shorter than2480nmis incident on it. The band gap (ineV) for thesemiconductor is?a)0.5b)0.9c)0.7d)1.1Correct answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice The electrical conductivity of a semiconductor increaseswhen electromagnetic radiation of a wavelength shorter than2480nmis incident on it. The band gap (ineV) for thesemiconductor is?a)0.5b)0.9c)0.7d)1.1Correct answer is option 'A'. Can you explain this answer? tests, examples and also practice Physics tests.
|
|
Explore Courses for Physics exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup