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What are the types of dielectric breakdown?
 

Important Questions on Electronic Devices

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The band gaps of an insulator, semiconductor and conductor are respectively Eg1, Eg2 and Eg3.The relationship between them can be given as:

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The band gap in Ge and Si in eV respectively is
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State anyone difference between the energy band diagram of conductors and that of insulators.

MEDIUM

On the basis of band theory, distinguish among insulator, semiconductor, and conductor of electricity.

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What will be the effect of increasing the temperature on the conductivity of pure semiconductor?
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Draw separate energy band diagrams for conductors, semi-conductors and insulators and label each of them.
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Which of the energy band diagrams shown in the figure corresponds to that of a semiconductor?
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Indium anti-monide has a band gap of 0.23 eV between the valence and the conduction band. Find the temperature at which kT equals the band gap.
MEDIUM
Energy gaps between the highest filled band and the lowest empty bands in elements A,B,C and D are 0, 70, 530 and 110 kJ mol-1. Thus :
HARD
Calculate the number of states per cubic meter of sodium in 3s band. The density of sodium is 1013 kg m-3. How many of them are empty?
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Metals are good conductors of heat as compared to the insulators because
MEDIUM
Differentiate between conductors, insulators and semiconductors on the basis of energy band theory. Explain the process of electrical conductance in intrinsic semiconductors.
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The forbidden energy gap in Ge is 0.72 eV, given, hc=12400 eV-A. The maximum wavelength of radiation that will generate electron hole pair is
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Find the maximum wavelength of electromagnetic radiation which can create a hole-electron pair in germanium. The band gap in germanium is 0.65 eV
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In insulators (CB is conduction band and VB is valence band)
HARD
The energy gap of silicon is 1.14 eV. At what wavelength the silicon will stop to absorb the photon?
MEDIUM

Represent the union of two sets by Venn diagram for each of the following.

X={x | x is a prime number between 80 and 100}

Y={y | y is an odd number between 90 and 100}

HARD
Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate ?
MEDIUM

If the lattice constant of this semiconductor is decreased, then which of the following is correct?

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EASY
Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate?