2018-2019 December

Explain with Diagram Hcp Unit Cell Based on Lattice Parameters.

Concept: Study of characteristics of unit cell of Diamond, ZnS, NaCl and HCP;

State properties of matter waves.

Concept: Properties of Matter Waves

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)

Explain Meissner Effect with the help of diagram.

Concept: Meissner Effect

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)

Discuss any three applications of Ultrasonic waves

Concept: Ultrasonic Wave Generation

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

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)

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

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

Concept: Hall Effect

Differentiate between Type-1 & Type- II Superconductors.

Concept: Type II Superconductors

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

remedies.

Concept: Acoustic Design of a hall

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;

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;

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

wavelength is;

λ = 12.26/√V A°.

Concept: De Broglie Wavelength

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

Explain Point defects in crystals.

Concept: Introduction to Crystallography

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

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

Concept: Phase Velocity and Group Velocity

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

Concept: Applications of Uncertainty Principle

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## University of Mumbai previous year question papers Semester 1 (FE First Year) Applied Physics 1 with solutions 2018 - 2019

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