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0000PHT110121905

tension in the string is 160 N, find the velocity of the wave in the string? How
long will a pulse take to travel from one support to the other?
۸۱۸01: 1
With necessary theory, describe an experiment to determine the diameter of a
thin wire using airwedge.
A non-reflecting film is to be deposited on a glass surface. What would be the
minimum thickness for zero reflection for ೩ light of wavelength550 nm? ॥ for
the film is 1.334.
Give the theory of plane transmission grating and explain intensity distribution.
Also define dispersive power and resolving power of grating
In Newton’s rings experiment the diameters of the 47 and 129 dark rings are
0.4cm and 0.7 respectively. Deduce the diameter of 20 dark ring.
۸100101-1
Write the Schrodinger’s equation for a particle in a one dimensional potential
well and obtain energy eigen values.
Compute the de Broglie wavelength of an electron with kinetic energy 4.5 keV.
What are nanomaterials? Explain the optical, electrical and mechanical
properties of nanomaterials.
A microscope using photons is employed to locate an electron in an atom
within a distance of0.2 A. What is the minimum uncertainty in the momentum
of the electron located in this way?
Module-IV
Explain reverberation and reverberation time. What is the significance of
reverberation time? Write down Sabine’s formula for evaluating reverberation
time and explain the terms.
What is threshold of hearing and threshold of pain intensity? Give their values.
With a neat diagram explain how the velocity of ultrasonic waves can be
determined using ultrasonic diffractometer.
Find the frequency of ultrasonic waves that can be generated by a nickel rod of
length 4em (Young’s modulus of nickel= 207GPa and density=8900 kg/m’).
Module-V
Explain the terms spontaneous emission, stimulated emission, population

inversion, and metastable state with respect to a laser system.

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