Applied Physics 2 - May 2014

First Year Engineering (Semester 2)

TOTAL MARKS: 60
TOTAL TIME: 2 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Use suitable data wherever required.
(4) Figures to the right indicate full marks.

Answer any five

1(a) Why the Newton's rings are circular and centre of interference pattern (reflect)is dark?(3 marks) 1(b) What is Rayliegh Criteria of resolution? What is resolving power of diffraction grating? (3 marks) 1(c) An optical glass fiber of refractive index 1.50 is to be clad with another glass to ensure internal reflection that will contain light travelling within 5° of the fiber axis. What maximum index of refraction is allowed for the cladding?(3 marks) 1(d) What is acronym 'LASER' ? How are they different then X-ray?(3 marks) 1(e) An electron is bound in one dimensional potential well of width 2A° that of infinite height Find its energy value in the ground state.(3 marks) 1(f) Explain measurement of frequency of AC signal using CRO.(3 marks) 1(g) What is the vertex state of a superconductor?(3 marks) 2(a) With Newton's ring experiment how to determine the refractive index of Liquid.
In newton's ring experiment the diameter of 15th dark ring was found to be 0.590 cm and that of 5th dark ring was 0.336cm. If the radius of curvature of planoconvex lens is 100cm, calculate the wavelength of light.(8 marks) 2(b) Differentiate between S.I fibre and GRIN fibre. Derive the expression for N.A for step index fiber. (7 marks) 3(a) What is holography? Explain its construction and reconstruction with neat diagram.(8 marks) 3(b) Obtain the condition for maximum and minima due to interference in a wedge shaped film observed in reflected light.Two optically plane glass strips of length 10cm are placed one over the other.A thin foil of thickness 0.01nn in introduced between them at one end to form an air film.If the light used has wavelength 5900 A°. Find the separation between consecutive bright fringes.(7 marks) 4(a) What is grating element? Derive condition for maximum diffraction at diffraction grating.(5 marks) 4(b) What is Heisenberg's uncertainty principle? Show that electron can not exit in nucleus. (5 marks) 4(c) What is superconductivity? Differentiate between Type-I and Type II superconductors.(5 marks) 5(a) In plane transmission grating, the angle of diffraction for the second order principle maxima for the wavelength 5×10^-5 Cm is 30°. Calculate the number of lines/cm on diffraction grating.(5 marks) 5(b) Derive one dimensional time dependent Schrodinger wave equation for matter wave.(5 marks) 5(c) With neat diagram explain construction and working of scanning Electron Microscope.(5 marks) 6(a) Calculate the velocity and DeBroglie Wavelength of an particle of energy KeV. Given Mass of α particle=6.68 × 16^-27kg(5 marks) 6(b) With neat diagram explain construction and working of CRT.(5 marks) 6(c) Explain the physical Methods for synthesis of Nano particles.(5 marks)