On the basis of band theory of solids the semiconductors have _____________________?
Correct answer: C. A completely filled valence band a partially filled conduction band and a narrow forbidden band
- A. A party filled valence band and totally empty conduction band
- B. A completely filled valence band a totally empty conduction band and a very wide forbidden band
- C. A completely filled valence band a partially filled conduction band and a narrow forbidden band
- D. A partly filled valence band a totally empty conduction band and a wide forbidden band
Explanation
A semiconductor has a filled valence band and a small forbidden energy gap, so some electrons can reach the conduction band at ordinary temperatures; the conduction band may then be partly occupied. The likely alternative is a, but a partly filled valence band is not the standard band description of an intrinsic semiconductor.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Quantum Theory and Radiation
Quantum theory treats electromagnetic radiation as packets of energy called photons, with energy proportional to frequency through E equals hf. The topic covers Planck's hypothesis, photon momentum, the photoelectric effect, threshold frequency, work function and wave particle duality, distinguishing quantised energy exchange from classical continuous radiation.
Practise Dawn of Modern Physics
739 free Dawn of Modern Physics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Quantum Theory and Radiation questions
The bulk properties of materials such as their mode of fracture can be related to their____________________?
The breaking of crystals along definite direction is called _____________________?
In simple cube one atom or molecule lies at its______________________?
With increase in temperature the electrical conductivity of intrinsic semi conductor___________________?
Which one has the greatest energy gap ?
The band theory of solids explains satisfactorily the nature of_________________?