Engineering Physics : Question Paper Dec 2014 - First Year Engineering (Semester 1) | Pune University (PU)

Engineering Physics - Dec 2014

First Year Engineering (Semester 1)


Answer any one question from Q1 and Q2

1 (a) Prove that in Newton's ring by reflected light the diameter of bright ring is proportional to square root of the odd natural numbers.(6 marks) 1 (b) Distinguish between musical sound and noise.(3 marks) 1 (c) A monochromatic beam of light of wavelength 5893° A° is incident normally on the top of a glass which is coated by transparent material MgF2 having R.I. 1.38. Calculate smallest thickness of the MgF2 layer which will act as a non reflecting surface.(3 marks) 2 (a) Define magnetostriction effect. Explain how magnetostriction oscillator is used to produce ultrasonic waves, with the help of neat ckt. Diagram.(6 marks) 2 (b) What is diffraction? What are the types of diffraction ? Distinguish between them (any two point).(3 marks) 2 (c) The average reverberation time of a hall is 1.5sec, and the area of interior surface is 3340m2. If the volume of the hall is 13000m3. Find the absorption coefficient.(3 marks)

Answer any one question from Q3 and Q4

3 (a) Explain the construction and working of Ruby laser with the help of energy level diagram.(6 marks) 3 (b) Explain Fermi Dirac probability distribution function with the meaning of each symbol in it.(3 marks) 3 (c) Calculate the conductivity of pure silicon at room temperature when the concentration of charge carriers is
1.6×1010/cm3. Given that μe=1500 cm2/V.Sec, μn=500 cm2/V.Sec.
(3 marks)
4 (a) Explain Hall effect. Derive the equation of Hall voltage and Hall coefficient.(6 marks) 4 (b) Explain propagation of light in a doubly refracting crystal when the optic axis is parallel to the crystal surface, with the help of neat diagram.(3 marks) 4 (c) How should the polariser and analyzer be oriented to reduce the beam of light to i) 50% ii) 25% of its original intensity.(3 marks)

Answer any one question from Q5 and Q6

5 (a) Deduce Schroedinger time independent wave equation.(6 marks) 5 (b) Define group velocity. Show that the group velocity of matter wave is equal to particle velocity.(4 marks) 5 (c) Calculate the de Broglie wavelength of electron having kinetic energy 1 KeV.(3 marks) 6 (a) State Heisenberg's uncertainty principle and prove it by thought experiment of electron diffraction at a single slit.(6 marks) 6 (b) What is wave function ? Explain what is normalization of wave function.(4 marks) 6 (c) An electron is trapped in a rigid box of width 2A°. Find its lowest energy level.(3 marks)

Answer any one question from Q7 and Q8

7 (a) Explain critical field of a superconductor and give any three points to differentiate type-I and type-II superconductors.(6 marks) 7 (b) Explain the applications of nanoparticles in automobile and electronic industry.(4 marks) 7 (c) Explain electrical properties of nano-particles.(3 marks) 8 (a) Explain the synthesis of nanoparticles in automobile and electronic by colloidal route with diagram.(6 marks) 8 (b) Explain the Meissner effect. What important property of superconductor it explain.(4 marks) 8 (c) Explain two applications of superconductivity.(3 marks)


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