Cochin University of Science and Techology (CUST) 2006 B.Tech Engineering Physics - Question Paper

Engineering Physics (June 2006)



1a. discuss with necessary theory the interference of light from a plane parallel sided thin transparent film, illuminated by a monochromatic light
b. discuss why an extended source of white light is needed to see colours in thin films
c. Determine the minimum wavelength reflected by a thin film of thickness 4.66x10^-5 cm and of refractive index 1.5 when it is illuminated by a white light.
2a. Distinguish ranging from continuous X-ray spectrum and characteristic X-ray spectrum
b. What is Moseley's Law? discuss its importance
c. An X-ray machine has an accelerating potential difference of 50 kV. compute the shortest wavelength and the corresponding maximum frequency
3a. Compare Fresnel and Fraunhoffer kinds of diffraction
b. discuss Fresnel's half period zone and show that the areas of Fresnel's half period zones are equal
c. Light of wavelength 5461 A is incident normally on a grating having a grating element 1.5x10^-4 cm. obtain the angle at which the 1st diffracted beam is observed
4a. define the construction, working and uses of a Nicol prism
b. discuss positive and negative crystals
c. elaborate the uses of polarized light?
5a. discuss spontaneous emission and stimulated emission
b. How population inversion is achieved?
c. discuss the working of Helium-Neon laser
6a. discuss the principle of Holography
b. explain the application of lasers in engineering
c. How magnetic tape recording is done
7a. discuss the folowing terms: numerical aperture, acceptance angle, acceptance cone
b. discuss the advantages of optical fibres over ordinary cable
c. compute the numerical aperture and acceptance angle of an optical fibre from the subsequent data: refractive index of core= 1.55 and refractive index of cladding= 1.55
8a. explain the single and multimode optical fibres
b. discuss the working of optical fibre sensors
c. Write a short note on integrated optics
9a. discuss the various kinds of electrio polarisation in dielecrics
b. Draw the planes with the subsequent : Miller Indices (111) (110) and (010)
c. compute the interplanar spacing for a (321) plane in a simple cubic lattice with a lattice constant a= 2.54A
10a.Explain superconductivity
b. Compare kind I and kind II superconductors
c. Write a short note on SQUIDS

Earning:   Approval pending.