Answer any five :-

1 (a)
Draw the following planes (121), (100), (111)

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1 (b)
State any three applications of superconductivity

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1 (c)
How Lissajous figure are used to determine phase difference?

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1 (d)
What are ultrasonic waves? State magnetostriction effect.

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1 (e)
State Sabine's formula.

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1 (f)
Calculate atomic packing factor for FCC crystal structure ?

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1 (g)
Show the position of Fermi level in intrinsic semiconductor, p-type semiconductor and n-type semiconductor.

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2 (a)
Explain Dimond crystal structure with proper diagram. Calculate the number of atoms per unit cell, atomic radius and atomic packing factor for diamond unit cell.

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2 (b)
What is cavitation effect? Kind the natural frequency of vibration of quartz plate of thickness 2mm,. Given: Young's modulus for quartz 8 x 10

^{10}N/m^{2}and density 2650 kg/m^{3}. Calculate the change in thickness required if the same plate is to be used to produce ultrasonic waves of 3 MHz.
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3 (a)
Explain reverberation and reverberation time. Explain various methods for design of good acoustics.

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3 (b)
What is lattice parameters? Aluminium has density 2.7 gm/cm

^{3}. It has atomic weight 27 and lattice parameter is 4.05 A?. Determine the type of crystal structure followed by Aluminium and calculate the atomic radius. Given Avogadro's number N_{A}= 6.023 x 10^{23}/gm mole.
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4 (a)
what is superconductivity and critical temperature? Descibe type I and type II superconductor.

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4 (b)
Define mobility of charge. Find resistivity of germanium at 300 ?K. Given density of carriers is 2.5 x 10

^{19}/m^{2}. Mobility of electron is 0.39 m^{2}/V-Sec and mobility of hole is 0.19 m^{2}/V-Sec. Charge of electron is 1.6 x 10^{19}C.
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5 (a)
State Hall effect and what is the signification of hall effect? N-type Ge sample has donor concentration 10

^{21}atoms/m^{3}. What hall voltage would you expect if current 1 x 10^{-3}A and if 0.5 magnetic field is applied across 2 mm thick sample.
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5 (b)
What is piezoelectric effect? Explain with neat labeled diagram the construction and working of Piezoelectric oscillator.

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6 (a)
State and explain terms in Bragg's law of X-ray diffraction. Calculate the glancing angle on cube (100) of rock salt having lattice constant 2.84 A? corresponding to first order diffraction maximum for X-ray of wavelength 1.541 A?

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6 (b)
Explain construction and working of CRO.

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Solve/Explain any three;

7 (a)
A class room has dimension 20 x 15 x 10 m

^{3}, the reverberation time is 3 sec. calculate total absorption of its surfaces and average absorption coefficient.
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7 (b)
Liquid crystal and different phase of liquid crystal

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7 (c)
Point defects in crystal

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7 (d)
Meissner effect

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