Applied Physics 1 CBCGS 2018-2019 BE Computer Engineering Semester 1 (FE First Year) Question Paper Solution

Applied Physics 1 [CBCGS]
Date: December 2018

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[15]1 | Attempt any five from the following .
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[3]1.a
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[1]1.a.1

Draw (123)

Concept: Introduction to Crystallography
Chapter: [1] Crystal Structure
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[1]1.a.2

Draw(321)

Concept: Introduction to Crystallography
Chapter: [1] Crystal Structure
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[1]1.a.3

Draw (102)

Concept: Introduction to Crystallography
Chapter: [1] Crystal Structure
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[3]1.b

Explain with Diagram Hcp Unit Cell Based on Lattice Parameters.

Concept: Study of characteristics of unit cell of Diamond, ZnS, NaCl and HCP;
Chapter: [1] Crystal Structure
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[3]1.c

State properties of matter waves.

Concept: Properties of Matter Waves
Chapter: [2] Quantum Mechanics
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[3]1.d

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.

Concept: Conductivity, mobility, current density (drift & diffusion) in semiconductors(n type and p type)
Chapter: [3] Semiconductor Physics
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[3]1.e

Explain Meissner Effect with the help of diagram.

Concept: Meissner Effect
Chapter: [4] Superconductivity
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[3]1.f

A conference room has a total volume of 2000 m3.The magnitude of total
absorption with in the conference room is100 Sabin.Calculate thereverberation time.

Concept: Reflection of Sound(Reverberation and Echo)
Chapter: [6] Acoustics
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[3]1.g

Discuss any three applications of Ultrasonic waves

Concept: Ultrasonic Wave Generation
Chapter: [7] Ultrasonics
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[15]2 | attempt following questions
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[8]2.a

State Heisenberg's Uncertainty Principle. Show that electron doesn'texist in
the nucleus.Find the accuracy in the position of an electron moving with speed 350
m/sec with uncertainty of 0.01%.

Concept: Introduction to Quantum Mechanics
Chapter: [2] Quantum Mechanics
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[7]2.b

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.

Concept: Conductivity, mobility, current density (drift & diffusion) in semiconductors(n type and p type)
Chapter: [3] Semiconductor Physics
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[15]3 | Attempt following questions.
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[8]3.a

Derive Bragg's condition for X-ray diffraction. Monochromatic X rays are
incident on a crystal. If the first order rejection is observed at an angle of 3.4•, at
what angle would second order reflection expected.

Concept: X-ray Diffraction
Chapter: [1] Crystal Structure
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[7]3.b

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

Concept: Hall Effect
Chapter: [3] Semiconductor Physics
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[15]4 | Attempt following questions
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[5]4.a

Differentiate between Type-1 & Type- II Superconductors.

Concept: Type II Superconductors
Chapter: [4] Superconductivity
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[5]4.b

Discuss in details any three factors affecting acoustics of a hall with their
remedies.

Concept: Acoustic Design of a hall
Chapter: [6] Acoustics
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[5]4.c

A quartz crystal of thickness 1 mm is vibrating at resonance. Calculate its fundamental frequency. (Assume that for quartz, Y= 7.9x 1010 N/m2 and p = 2.650 gm/cc.

Concept: Study of characteristics of unit cell of Diamond, ZnS, NaCl and HCP;
Chapter: [1] Crystal Structure
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[15]5 | Attempt following questions
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[5]5.a

Define Ligancy. Find the value of critical radius ratio for Ligancy 3.

Concept: Study of characteristics of unit cell of Diamond, ZnS, NaCl and HCP;
Chapter: [1] Crystal Structure
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[5]5.b

For an electron passing through potential difference V, show that its
wavelength is;

λ = 12.26/√V A°.

Concept: De Broglie Wavelength
Chapter: [2] Quantum Mechanics
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[5]5.c

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.

Concept: Fermi Energy Level in Intrinsic Semiconductors
Chapter: [3] Semiconductor Physics
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[15]6 | Attempt following questions
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[5]6.a

Explain Point defects in crystals.

Concept: Introduction to Crystallography
Chapter: [1] Crystal Structure
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[5]6.b

Show that group velocity of matter waves associated with a particle is equal to
the particle velocity(Vgroup=Vparticle)

Concept: Phase Velocity and Group Velocity
Chapter: [2] Quantum Mechanics
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[5]6.c

Explain the principle, construction and working of Light Emitting Diode.

Concept: Applications of Uncertainty Principle
Chapter: [2] Quantum Mechanics

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