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B2B1014

An ultrasonic source of 0.09 MHz sends down a pulse towards the sea bed which
10101115 after 0.55 sec. The velocity of sound in sea water is 1800 m/sec. Calculate
the depth of the sea and the wave length of the pulse.

Explain the recording and reconstruction of hologram.

Calculate the numerical aperture and acceptance angle of a fibre with a core index
of 1.54 and a cladding index of 1.50 when the fibre is inside water of refractive
index 1.33.
PART C
Answer any three questions, each carries 6 marks.

Write down the differential equation of a damped harmonic oscillator and obtain its
solution. Show graphically the displacement -time curve for over damped,
critically damped and under damped cases of a harmonic oscillator. Mention the
conditions of their occurrence.
Derive an expression for the diameter of a thin wire in air wedge experiment.
Distinguish between Type I and Type II superconductors with suitable diagrams
and examples.
Write down the Schrodinger equation for a particle in a one-dimensional infinite
potential well. Also derive the equation for wave function and energy.
PART C

Answer any three questions. Each question carries 6 marks
Explain the production of ultrasonic waves using a piezo electric oscillator with the
help of a neat labelled circuit diagram.
What are the factors affecting acoustics of buildings? Give remedies.
Explain the principle, construction and working of Helium-Neon laser with the

help of energy level diagram.

What is an LED? Explain the construction and working of LED. Give two
applications.

TR KK ‏بد‎

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