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Posted Date: 21 Feb 2009 Posted By: Suganthi Member Level: Bronze
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2009 Anna University Engineering Physics B.E/B.Tech.DEGREE EXAMINATION,JANUARY 2009. Question paper
C 3908
B.E/B.Tech. DEGREE EXAMINATION, JANUARY 2009
First Semester
Civil Engineering
PY 2111-ENGINEERING PHYSICS-I
(Common to all branches of B.E./B.Tech)
(Regulating 2008)
Time : Three hours Maximum : 100 marks
Answer ALL questions.
PART A-(10x2=20)
What is sonar? Mention two applications of it.
A ultrasonic generator consists of a quartz plate of thickness 0.7 mm and density 2800 kg/m3. Find the fundamental frequency of ultrasonic waves if the Young’s modulus of quartz is 8.8x?10?^10 N/m².
Define population inversion and metastable state.
What are the advantages of hetrojunction semiconductor laser over homojunction semiconductor laser?
Distinguish between step index fiber and graded index fibre.
A silica optical fiber has a core refractive index of 1.50 and a cladding refractive index of 1.47. Calculate the critical angle at the core-cladding interface.
What is Compton wavelength and calculate its value.
What is the physical significance of wave function ??
State the values of coordination number for HCP structure and diamond structure.
The lattice constant for a FCC structure is 4.938 Å. Calculate the interplanar spacing of (220) planes.
Part B-(5x16=80 marks)
(a) (i) What is inverse piezo electric effect? [Marks 2]
(ii) Describe the construction and working of a piezo electric generator to produce ultrasonic waves. [Marks 10]
(iii) State the merits and demerits of magnetostriction oscillator. [Marks 4]
Or
(b) (i) what is acoustic grating? [Marks 2]
(ii) Describe the method of determining the velocity of ultrasonic waves using acoustic grating. [Marks 10]
(iii) Mention any four applications of ultrasonic waves. [marks 4]
(a) (i) Distinguish between spontaneous emission and stimulated emission of radiation. [marks 4]
(ii) Describe the construction and working of He-Ne laser with energy level diagram. [marks 10]
(iii) What are Einstein’s A and B coefficients? [mark 2]
Or
(b) (i) Describe the vibrational modes of CO2 molecule. [mark 3]
(ii) Describe the construction and working of CO2 laser with energy level diagram. [marks 10]
(iii) For a semiconductor laser, the band gap is 0.8eV. What is the wavelength of light emitted from it. [marks 3]
(a) (i) Define acceptance angle and numerical aperture. [marks 2]
(ii) Derive the expression sin?_m =v(n1²+n2²) [marks 8]
(iii) Describe a method of measuring the temperature of a sourse using fiber optic sensor. [marks 6]
Or
(b) (i) Describe a Fiber optic communication system. [marks 6]
(ii) Describe the principle , construction and working of light emitting diode. [marks 8]
(iii) State the advantages of light emitting diodes in electronic display. [marks 2]
(a) (i) What is Compton effect? [marks 2]
(ii) Derive an expression for the wavelength of scattered X ray photon from a material. [marls 10]
(iii) A X ray photon of wavelength 1.24x10¯³Å is scattered by a free electron through an angle of 90°. Calculate the energy of the scattered photon. [marks 4]
Or
(b) (i) Derive the Schroedinger’s time independent wave equation. [marks 8]
(ii) Apply Schroedinger wave equation to a particle in one dimentional box and calculate the eigen value and eigen function. [marks 8]
(a) (i) What are Bravais lattice? [marks 2]
(ii) Derive an expression for the interplanar spacing in a cubic structure. [marks 8]
(iii) With a neat diagram describe the edge dislocation. [marls 6]
Or
(b) (i) Define Atomic radius and packing fraction. [marks 2]
(ii) Describe a HCP structure. Show that for an HCP structure c/a=v(8/3) and hence calculate the packing fraction for the HCP structure. [marks 10]
(iii) The lattice constant of a metal with cubic lattice is 2.88Å. The density of metal is 7200 kg/m³. Calculate the number of the unit cell present in 1kg of the metal. [marks 4]
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