STUPIDSID
Slove any five from the following
1 (a)
Define the term space lattice, unit cell and lattice parameter.
3 M
1 (b)
Find the interplaner spacing between the family of planes (111) in a crystal of lattice constant 3A?.
3 M
1 (c)
Represent the following in the cubic unit cell :-
(IT2), (002), [121]
(IT2), (002), [121]
3 M
1 (d)
Define drift current, diffusion current and mobility of charge carriers.
3 M
1 (e)
Explain the use of P-N junction as a solar cell.
3 M
1 (f)
State with neat diagram direct and inverse Piezoelectric effect.
3 M
1 (g)
What is magnetic circuit? Explain Ohm's Law on case of magnetic circuit.
3 M
2 (a)
Explain the hall effect in metal ? Derive the formulae to determine the density and mobility of the electrons.
8 M
2 (b)
Define ligancy and critical radius ratio in case of ionic solid. Write the conditions for stability of ionic crystal in 3-D ? Determine critical radius ratio for ligancy 6.
7 M
3 (a)
Explain with neat diagram construction of Bragg's X-ray spectrometer ? Write the procedure to determine crystal structure. Calculate the maximum order of diffraction if X-ray of wave length 0.819 A? is incident on a crystal of lattice spacing 0.282 nm.
8 M
3 (b)
Calculate the number of turns required to produce a magnetic flux of 4 x 105 wb, if iron rod of length 50cm and cross sectional area 4 cm2 carrying an electric current 1A is in the form of ring.(Permeability of iron is 65 x 10-4 H/m).
7 M
4 (a)
What is mesomorphic state of matter ? Explain with neat diagram cholesteric phase.
5 M
4 (b)
What is dielectric polarization and dielectric susceptibility? Find the relation between them?
5 M
4 (c)
The resistivity of intrinsic InSb at room temperature is 2 x 10-4? cm. if the mobility of electron is 6m2/V-Sec and mobility of hole is 0-2 m2/V-Sec. calculate its instrinsic carrier density.
5 M
5 (a)
Identify the crystal structure if its density is 9.6 x 102 kg/m3, lattice constant is 4.3 A? and atomic weight is 23.
5 M
5 (b)
Explain the formation of depletion region in P-N junction.
5 M
5 (c)
Define reverberation time ? State Sabine's formula and explain the terms involved in it?
5 M
6 (a)
What are soft and Hard magnetic materials ? State their properties and applications.
5 M
6 (b)
What is Fermi level in semiconductor? Show that in intrinsic semiconductor Fermi level always at the middle between the forbidden energy gap?
5 M
6 (c)
An Ultrasonic sound wave is used to detect the position of defect in a steel bar of thickness 50 cm. if the echo times are 40 and 90 ?-sec. Locate the position of defect.
5 M
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