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RGPV First Year Engineering (Set B) (Semester 1)
Engineering Physics
December 2014
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Answer the any one question from Q1 & Q1 (e)
1 (a) What do you understand by wave function, discuss its physical significance?
2 M
1 (b) State and explain Heisenberg?s uncertainty principle. Explain diffraction of electron beam by a single slit to illustrate this principle.
2 M
1 (c) The uncertainty in measuring the speed of an accelerated electron is 1.2?105 m/s. Calculate the uncertainty in finding its location, while it is still in motion. Given h=6.626?10?34 Js and Mass of electron=9.31?10?31 kg.
3 M
1 (d) What is meant by operators? Obtain an operator for the energy ?E?, momentum ?p? and use them to obtain Schrodinger wave equation.
7 M
1 (e) Define particle velocity, group velocity and phase velocity and derive the relation between them.
14 M

Answer the any one question from Q2 & Q2 (e)
2 (a) Explain the difference between interference and diffraction of light.
2 M
2 (b) State Brewster?s law and prove that at Brewster?s angle the reflected and refracted rays are perpendicular to each other.
2 M
2 (c) In Newton?s ring experiment the diameter of 15th dark ring was found to be 0.59 cm and that of the 5th ring was 0.336 cm. If the radius of curvature of plano-convex lens is 100 cm. Calculate the wavelength of light used.
3 M
2 (d) Explain the formation of Newton?s ring in reflected light. Prove that in reflected light [ D_n propto sqrt{n} and D_n propto sqrt{2n+1} ] where Dn and D'n is diameter of dark and bright ring respectively.
7 M
2 (e) Discuss the phenomena of Fraunhofer diffraction at double slit. Derive the condition for maxima and minima for double slit diffraction pattern.
14 M

Answer the any one question from Q3 & Q3 (e)
3 (a) Why do we say that the nucleus behaves like a liquid drop?
2 M
3 (b) What do you understand by mass defect and binding energy with respect to the nucleus?
2 M
3 (c) The radius of Cyclotron dee's is 40 cm and magnetic field is 1.5 Wb/m2. What is the maximum kinetic energy of beam of proton accelerated by the Cyclotron? Given mass of proton=1.67×10-27 kg and Charge on Proton = 1.6×10-19 C.
3 M
3 (d) Explain construction, principle of working and limitations of LINAC. In LINAC show that the length Ln of the nth drift tube is proportional to √n.
7 M
3 (e) Discuss the construction and working of Cyclotron with neat diagram. Derive and explain resonance condition.
14 M

Answer the any one question from Q4 & Q4 (e)
4 (a) Superconductor is a perfect diamagnetic. Explain briefly.
2 M
4 (b) What is Zener breakdown. Explain briefly
2 M
4 (c) A n-type semiconductor specimen has Hall coefficient RH=3.66×10-4 m3/C. The conductivity of specimen is found to be 112 ohm-1 m-1. Calculate the charge carrier density and electron mobility at room tempertature.
3 M
4 (d) What is Hall effect? Deduce expression for Hall coefficient and Hall voltage of a solid. What important information's are obtained from its measurement?
7 M
4 (e) State and explain the terms dielectric polarization and Gauss's law. Derive the interrelationship between E, P and D vectors.
14 M

Answer the any one question from Q5 & Q5 (e)
5 (a) What is meant by stimulate emission? Explain the basic condition in which stimulated emission dominated.
2 M
5 (b) Differentiate between Step Index and Graded Index optical fiber cable.
2 M
5 (c) A glass clad fiber has cladding refractive index 1.49925 and fractional refractive index of 0.0005. Determine the critical internal reflection angle.
3 M
5 (d) Explain the construction and working of Ruby LASER with necessary energy level diagram.
7 M
5 (e) Describe the construction of an optical fiber. Explain the principle of propagation of light waves within a fiber. Define acceptance angle, acceptance cone and numerical aperture..
14 M

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