An n-type semiconductor is
- neutral
- positively charged
- negatively charged
- negatively or positively charged depending on the amount of impurity added
The Correct Option is A
Solution and Explanation
Top Questions on band theory of solids
- The forbidden energy gaps in conductors, semiconductors and insulators are (Eg)c, (Eg)s and (Eg)1 respectively. What is the relation among them ?
- CUET (UG) - 2023
- Physics
- band theory of solids
- Energy band gap is maximum in:
- CUET (UG) - 2023
- Physics
- band theory of solids
- The energy gap of silicon is $1 .1 4 \,eV$. The maximum wavelength at which silicon starts energy absorption, will be $(h = 6.62 \times 10^{-34}\, J\, s$; $c = 3 \times 10^8\, ms^{ -1})$
- UP CPMT - 2013
- Physics
- band theory of solids
- In the energy band diagram of a material shown below, the open circles and filled circles denote holes and electrons respectively. The material is a/an
- AIIMS - 2007
- Physics
- band theory of solids
- The energy gaps $(E_g)$ between valence band and conduction band for diamond, silicon and germanium are in the order
- AIIMS - 2006
- Physics
- band theory of solids
Questions Asked in VITEEE exam
- Two identical blocks A and B, each of mass 'm' resting on a smooth floor are connected by a light spring of natural length L and spring constant K, with the spring at its natural length. A third identical block 'C' (mass m) moving with a speed v along the line joining A and B collides with A. the maximum compression in the spring is
- VITEEE - 2023
- work, energy and power
- Assertion :
The binding energy of the nucleus increases with the increase in atomic number.
Reason :
Heavier elements have a greater number of non-radioactive isotopes than radioactive isotopes. - The half-life of radioactive radon is 3.8 days. The time at the end of which \(\frac{1}{20}th\) of the Radon sample will remain undecayed is (given log10e=0.4343)
- Which element has more electron gain enthalpy among chalcogen group?
- VITEEE - 2022
- sulphur
- Coin is tossed till heads is obtained what is expectation of no. of coin tosses
- VITEEE - 2022
- Random Variables
Concepts Used:
Band theory of solids
Band theory of solids expresses the quantum state that an electron takes inside a metal solid. Every molecule comprises various discrete energy levels. In the band theory, you will get to know how the electrons behave inside a molecule.
Energy Bands in Solids:
Valence band
The energy band that consists of the valence electrons' energy levels is called the valence band. The valence band is available just below the conduction band and the electrons of this band are loosely bound to the nucleus of the atom.
Conduction band
The energy band comprises free electrons energy levels, known as the conduction band. For electrons to be free, external energy must be applied such that the valence electrons get struck to the conduction band and become free.
Forbidden band
The energy gap between the valence band and the conduction band is commonly known as the forbidden band which is also known as the forbidden gap. The electrical conductivity of a solid is set by the forbidden gap and the classification of the materials is done as conductors, semiconductors, and insulators.
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