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Pune University - FY BSc PHYSICS - II, April 2010

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Total No. of Questions : 5] P182 [Total No. of Pages : 3 [3717] - 4 F.Y. B.Sc. PHYSICS - II Emerging Physics and Electricity and Magnetism (Paper - II) (New Course) (11220) Time : 3 Hours] [Max. Marks : 80 Instructions to the candidates : 1) All questions are compulsory. 2) Figures to the right indicate full marks. 3) Use of log tables and calculator is allowed. 4) Draw neat diagrams and sketches wherever necessary. Q1) Attempt all of the following : a) What is population inversion? [2] b) The distance between two consecutive R peaks on the electro cardiograph is 40 mm. If the paper speed of recorder is 48 mm/sec, what is the heat rate? [2] c) Give in short, the contributions of Marie Curie in physics. [2] d) Define a transducer and give two examples. [2] e) Explain Electric Intensity. [2] f) A proton of mass 1.67 x 10 27 kg experiences a force of 3.34 x 10 15N. Calculate the acceleration produced. [2] g) Define magnetic susceptibility. [2] h) Explain time constant in LR circuit. [2] Q2) Attempt any four of the following : a) Write a note on contributions of C.V. Raman and S.Chandrasekhar in development of physics. [4] b) Explain the characteristics of a laser beam. [4] c) Explain photodiode sensors. [4] d) The energy difference between two laser levels is 0.117 eV. Determine the frequency and wavelength of the radiation. [Given : h = 6.626 x 10 34 Js, c = 3 x 108 m/s] [4] P.T.O.

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Additional Info : F.Y.B.Sc. PHYSICS - II : Emerging Physics and Electricity and Magnetism (Paper - II) (New Course), Pune University
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