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Question Paper Solutions for Applied Physics 1 CBCGS 2018-2019 BE Chemical Engineering Semester 1 (FE First Year)

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Applied Physics 1
CBCGS
2018-2019 December
Marks: 60

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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)

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

Draw(321)

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

Draw (102)

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

Explain with Diagram Hcp Unit Cell Based on Lattice Parameters.

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

State properties of matter waves.

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

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

Explain Meissner Effect with the help of diagram.

Chapter: [4] Superconductivity
Concept: Meissner Effect
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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.

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

Discuss any three applications of Ultrasonic waves

Chapter: [7] Ultrasonics
Concept: Ultrasonic Wave Generation
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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%.

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

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

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

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

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

Differentiate between Type-1 & Type- II Superconductors.

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

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

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

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

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

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

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

Explain Point defects in crystals.

Chapter: [1] Crystal Structure
Concept: Introduction to Crystallography
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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)

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

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

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

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