Engineering FE Engineering Common Sem 2 Engineering Physics II Dec 2019 CBSGS Question Paper - Mumbai University | munotes

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Q2 Attempt any three questions from remaining three questions
Q4 Figures on the right indicates marks 1 Attempt any five 15 a In Newton’s ring experiment the diameter of 5" dark ring is 0.5cm, calculate the diameter of 20" dark ring b What is meant by absent spectra? Write the condition of absent spectra c A fiber cable has an acceptance angle of and a core refractive index is 1.4 Calculate the refractive index of cladding d What is resonance cavity? Explain its importance in Lasers e What is the wave function of matter wave? Explain its physical significance f How do you measure phase difference between two A.C. signals by CRO? g Define superconductivity and explain the statement, “Diamagnetism is the test of 2 a_ For Newton’s ring, prove that diameter of nth dark ring is directly proportional to 5 the square root of natural number If the diameter of and (n+10)" Newton’s dark ring are 4mm and 8mm respectively. Determine the wavelength of light used if the radius of curvature is 3 Differentiate between Step Index and graded Index optical fiber and derive an 7 expression for numerical aperture of step index optical fiber 3 a How is laser different than that of ordinary source of light? With neat diagram 8 explain the construction and working of Nd-YAG Laser Why are the fringes straight in the interference pattern of wedge shaped film? 7 Derive an expression for fringe width 4 a What is grating element? A monochromatic light of wavelength cm falls 5 normally on a grating of 2cm wide. The first order maxima is produced at from the normal. What are the total number of lines on the grating? b is Heisenberg’s uncertainty principle? Prove it using single slit electron 5
- c. What are critical temperature critical magnetic field of superconducting 5 material? The transition temperature for Pb is 7.2 k. At 5 k it losses the superconducting property if subjected to magnetic field of 4x10*A/m. Find the critical magnetic field at Ok For plane transmission grating, prove that the condition of diffraction maximumis 5 With neat diagram, explain the construction and working of electron microscope. 5 6 has momentum of 5x kg-m/s with an accuracy of 0.05%. Find the 5 minimum uncertainty in the location of electron b With neat diagram explain the construction and working of Cathode Ray Tube. 5 c What are Nano materials? Explain one of the method of its production in detail. 5

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