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BE Electronics and Telecommunication Engineering

Academic Year: 2018-2019

Date: December 2018

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Explain with Diagram Hcp Unit Cell Based on Lattice Parameters.

Chapter: [1] Crystal Structure

State properties of matter waves.

Chapter: [2] Quantum Mechanics

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

Explain Meissner Effect with the help of diagram.

Chapter: [4] Superconductivity

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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

Discuss any three applications of Ultrasonic waves

Chapter: [7] Ultrasonics

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

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

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

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

Chapter: [3] Semiconductor Physics

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Differentiate between Type-1 & Type- II Superconductors.

Chapter: [4] Superconductivity

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

remedies.

Chapter: [6] Acoustics

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

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

Chapter: [1] Crystal Structure

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

wavelength is;

λ = 12.26/√V A°.

Chapter: [2] Quantum Mechanics

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

Explain Point defects in crystals.

Chapter: [1] Crystal Structure

Show that group velocity of matter waves associated with a particle is equal to

the particle velocity(V_{group}=V_{particle})

Chapter: [2] Quantum Mechanics

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

Chapter: [2] Quantum Mechanics

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