Important Questions for BE Printing and Packaging Technology Semester 1 (FE First Year) - University of Mumbai - Applied Physics 1

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In a solid the energy level is lying 0.012 eV below Fermi level. What is the probability of this level not being occupied by an electron 27℃?

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Chapter: [3] Semiconductor Physics
Concept: Fermi Energy Level in Intrinsic Semiconductors

Write the Fermi Dirac distribution function and terms in it. What is the probability of an electron being thermally excited to the conduction band in Si at 30 ℃. The band gap energy is 1.12 eV.

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Chapter: [3] Semiconductor Physics
Concept: Fermi Dirac Distribution Function

With energy band diagram , explain the variation of fermi energy level with impurity concentration in extrinsic semiconductor.

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Chapter: [3] Semiconductor Physics
Concept: Effect of Impurity Concentration on Fermi Level

Show that fermi energy level in intrinsic semiconductor is at the Centre of forbidden energy gap. What is the probability of an electron being thermally excited to the conduction band in Si at 30℃. The band gap energy is 1.12 eV.

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Chapter: [3] Semiconductor Physics
Concept: Fermi Energy Level in Intrinsic Semiconductors

With energy band diagram ,explain the variation of fermi energy level with temperature in extrinsic semiconductor .

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Chapter: [3] Semiconductor Physics
Concept: Fermi energy level in extrinsic semiconductors

Calculate electron & hole concentration in intrinsic Si at room temperature if
its electrical conductivity is 4x10-4 mho/m.Given that mobility of electron=
0.14m2/V-sec and  mobility of holes=0.04m2/V-sec.

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Chapter: [3] Semiconductor Physics
Concept: Conductivity, mobility, current density (drift & diffusion) in semiconductors(n type and p type)

Show that for intrinsic semiconductors of the Fermi level lies midway between the conduction band and the valence band .With the help of diagram explain effect of impurity concentration on Fermi level of N type semiconductor.

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Chapter: [3] Semiconductor Physics
Concept: Conductivity, mobility, current density (drift & diffusion) in semiconductors(n type and p type)

Derive an expression for Hall voltage and Hall coefficient with neat labelled diagram.

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Chapter: [3] Semiconductor Physics
Concept: Hall Effect

What is the probability of an electron being thermally excited to conduction
band in Si at 27cC.The band gap energy is 1.12 eV.

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Chapter: [3] Semiconductor Physics
Concept: Fermi Energy Level in Intrinsic Semiconductors

Calculate conductivity of a germanium sample if a donar impurity atoms are added to the extent to one part in 10 germanium atoms at room temperature.
Assume that only one electron of each atom takes part in conduction process.

Given:- Avogadro’s number = 6.023 × 1023 atom/gm-mol .
Atomic weight of Ge = 72.6

Mobility of electrons = 3800 (cm^2) / ( "volts")  sec

Density of Ge = 5.32 gm/ cm3

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Chapter: [4] Superconductivity
Concept: Type I superconductors

Discuss formation of copper pairs and energy gap in superconductor on the basis of BCS theory.

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Chapter: [4] Superconductivity
Concept: BCS Theory (concept of Cooper pair)

What is Maglev? How it can have very high speed?

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Chapter: [4] Superconductivity
Concept: Applications of superconductors- SQUID, MAGLEV

Define the critical temperature. Slow that in the superconducting state the material is perfectly diamagnetic.

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Chapter: [4] Superconductivity
Concept: Meissner Effect

What is working principle of SQUID ? Explain how it is used to detect the magnetic field?

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Chapter: [4] Superconductivity
Concept: Applications of superconductors- SQUID, MAGLEV

What is the working principle of maglev? Explain how it can acquire high speed?

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Chapter: [4] Superconductivity
Concept: Applications of superconductors- SQUID, MAGLEV

Explain Meissner Effect with the help of diagram.

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Chapter: [4] Superconductivity
Concept: Meissner Effect

Differentiate between Type-1 & Type- II Superconductors.

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Chapter: [4] Superconductivity
Concept: Type II Superconductors

What is reverberation time? Discuss sabine formula.

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Chapter: [6] Acoustics
Concept: Reflection of Sound(Reverberation and Echo)

State any five factors affecting the acoustics of the building and give the remedies for each.

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Chapter: [6] Acoustics
Concept: Reflection of Sound(Reverberation and Echo)

Explain the factors on which reverberation time depends .

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Chapter: [6] Acoustics
Concept: Reflection of Sound(Reverberation and Echo)
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