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Academic Year: 2016-2017
Date: June 2017
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Draw the unit cell of HCP structure and work out the no. of atoms per unit cell.
Chapter: [1] Crystal Structure
The mobility of holes is 0.025m2 /V-sec. what would be the resistivity of n- type Si if the Hall coefficient of the sample is 2.25× 10-5m3/C.
Chapter: [3] Semiconductor Physics
What is the principle of solar cell? Write its advantages and disadvantages
Chapter: [1] Crystal Structure
An electron is confined in a box of dimension 1A°. calculate minimum uncertainty in its velocity.
Chapter: [2] Quantum Mechanics
Explain the factors on which reverberation time depends .
Chapter: [6] Acoustics
What is Maglev? How it can have very high speed?
Chapter: [4] Superconductivity
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Draw the following : (1,-1,3) ,(2,0,0) , [0,0,-1]
An electron is accelerated through 1200 volts and is reflected from a crystal. The second order reflection occurs when glancing angle is 60°. Calculate the inter planar spacing of the crystal.
Chapter: [1] Crystal Structure
Explain the concept of fermi level. Prove that the Fermi level exactly at the centre of the Forbidden energy gap in intrinsic semiconductor.
Chapter: [3] Semiconductor Physics
Find the following parameter for DC(Diamond Cubic) structure:-
⦁ No. of atoms per unit cell.
⦁ Co-ordination number.
⦁ Nearest atomic distance.
⦁ Atomic radius.
⦁ APF.
Chapter: [1] Crystal Structure
Define drift current, diffusion current and P-N junction. The electrical conductivity of a pure silicon at room temperature is 4×10-4 mho/m . if the mobility of electron is 0.14m2 /V-S and that of hole is 0.04m2 /V-S. calculate the intrinsic
carrier density.
Chapter: [3] Semiconductor Physics
Distinguish between Type I and Type II superconductor.
Chapter: [3] Semiconductor Physics
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A classroom has dimension 10×8×6m3. the reverberation time is 3 sec. calculate the total absorption of surface and average absorption.
Chapter: [6] Acoustics
Explain the principle, construction and working of a Magnetostriction Oscillator.
Chapter: [7] Ultrasonics
Write Fermi Dirac distribution function. With the help of diagram. Explain the variation of Fermi level with temperature in n-type semiconductor.
Chapter: [3] Semiconductor Physics
Derive Schrodinger time dependent wave equation for matter waves.
Chapter: [2] Quantum Mechanics
Find the depth of sea water from a ship on the sea surface it the time interval of two seconds is required to receive the signal back. Given that: temperature of sea water is 20℃, salinity of sea water is 10gm/lit.
Chapter: [3] Semiconductor Physics
Define the critical temperature. Slow that in the superconducting state the material is perfectly diamagnetic.
Chapter: [4] Superconductivity
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℃?
Chapter: [3] Semiconductor Physics
What is the wavelength of a beam of neutron having:
⦁ An energy of 0.025 eV?
⦁ An electron and photon each have wavelength of 2A°. what are their momentum and energy ? mn = 1.676×10 -27 kg, h = 6.625×10 -34 J-sec.
Chapter: [2] Quantum Mechanics
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University of Mumbai previous year question papers Semester 1 (FE First Year) Applied Physics 1 with solutions 2016 - 2017
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