Question Paper: Engineering Physics : Question Paper Oct 2012 - First Year Engineering (Semester 2) | Pune University (PU)

Engineering Physics - Oct 2012

First Year Engineering (Semester 2)

(1) Solve Q.1 or Q.2, Q.3 or Q.4, Q.5 or Q.6, Q.7 or Q.8
(2) Assume suitable data, if necessary.

Answer any one question from Q1 & Q2

1 (a) Prove that in Newton's Ring by reflected light the diameter of bright ring are proportional to the square root of the odd natural number.(6 marks) 1 (b) Explain any one application of Ultrasonic Waves.(3 marks) 1 (c) he average reverberation time of a hall is 1.5 sec. and the area of the interior surface is 3340m2. If the volume of the hall is 13000m3. Find the absorption coefficient.(3 marks) 2 (a) Explain how piezoelectric effect can be used for generating Ultrasonic Waves?(6 marks) 2 (b) Define fringe width for wedge shaped film, obtain an expression for it.(3 marks) 2 (c) Find the half angular width of the central maxima in the fraunhofer diffraction pattern of slit having width 10 ×10-5 cm. When illumininated by light having wave length 5000 A°(3 marks)

Answer any one question from Q3 & Q4

3 (a) tate the Phenomena of Double Refraction. Hence explain Huygen's Wave Theory of Double Refraction.(6 marks) 3 (b) Draw energy band picture for P-N junction in case of (i) Zero Bias (ii) Forward Bias (iii) Reverse Bias.(3 marks) 3 (c) A silver wire is in the form of a ribbon 0.5cm wide and 0.1 mm thick. When a current of 2A passes through the ribbon perpendicular to 0.8 Tesla Magnetic Field. Calculate the Hall Voltage produced.
(Given : Density of Silver = 10.5 gm/cc, Atomic Weight of Silver = 108, Avogadros No. 6.02 × 1023 gm/mole)
(3 marks)
4 (a) Derive an expression for Conductivity in Semiconductor.(6 marks) 4 (b) Explain any one application of Laser.(3 marks) 4 (c) How should the Polarizer and Analyzer be oriented to reduce intensity of beam to (i) 50% (ii) 0.25 of its original intensity ?(3 marks)

Answer any one question from Q5 & Q6

5 (a) Define Phase Velocity and Group Velocity. Hence obtain the relation between Vp and Vg for DeBroglie Wave.(6 marks) 5 (b) Explain the physical significance of ? and |?|2.(4 marks) 5 (c) An electron is bounded by an infinite potential well of width 2 ×10-8. Calculate the lowest two permissible energies of an electron.
(Give: h=6.64×10-34 J- sec., m=9.1 × 10-31 kg)
(3 marks)
6 (a) Derive Schrodinger's Time Independent Wave Equation.(6 marks) 6 (b) tate DeBroglie's Hypothesis. Hence obtain the relation for DeBroglie's Wave Length in terms of Energy.(4 marks) 6 (c) he position and momentum of 1 kev electron are simultaneously measured. If its position is located within 1A°. Find the percentage of uncertainty in its momentum.
(Given: h=6.64×10-34 J-sec., m=9.1×10-31 kg)
(3 marks)

Answer any one question from Q7 & Q8

7 (a) Explain the Phenomena of Super-conductivity. Explain Type - I and Type - II Super-conductors.(6 marks) 7 (b) Explain any two applications of Nano-technology.(4 marks) 7 (c) Explain any two properties of Nano-particle.(3 marks) 8 (a) Explain Synthesis of Metal Nano-particle by Collidal Route Method.(6 marks) 8 (b) Explain BCS Theory of Super-conductivity.(4 marks) 8 (c) State and explain:
(i) Meissner Effect
(ii) Persistent Current
(3 marks)

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