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NSA192003 Pages:3

Module-II
Explain how Newton’s rings are formed? Show that the radius of dark ring
formed by Newton’s rings is proportional to square root of the order of the
ring.
Light of wavelength 5893A is reflected at nearly normal incidence from a
soap film of refractive index 1.42. What is the least thickness of the film that
will appear (i) dark and (ii) bright?
What is a plane transmission grating? Derive the grating equation. What is
Rayleigh’s criterion for spectral resolution?
What is the highest order spectrum which may be obtained with a light of
wavelength 650 nm by means of a plane transmission grating having
5000 lines per cm?

Module-III
Derive Schrodinger’s time dependent equation and hence obtain time
independent equation.
Explain the absence of electron in the nucleus.
Write the significance of material at nanoscale and explain the quantum
confinement in nanomaterials.
Discuss quantum mechanical tunnelling and give two examples.

Module-IV
Explain any six factors affecting acoustics of a hall and give their remedial
measures.
An auditorium has dimensions 45m X 10m X 8m. The average absorption
coefficients of wall, ceiling and floor are 0.8, 0.4 and 0.5 respectively.
Evaluate reverberation time of the hall.
What is inverse piezoelectric effect? How is ultrasonic wavesdetected using
piezoelectric effect? What is NDT? Explain any one NDT method.
Calculate the fundamental frequency of vibration of quartz crystal of
thickness 8mm at resonance if its Young's modulus is
۷ = 7.9 x 10/°N/m2and density =2650kg/m?.

Module-V
Explain the construction and working of a ruby laser with schematic and

energy level diagrams.

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