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Code: 13A56101
B.Tech I Year (R13) Supplementary Examinations December 2019
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ENGINEERING PHYSICS
(Common to all branches)
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Time: 3 hours Max. Marks: 70
PART - A
(Compulsory Question)
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1 Answer the following: (10 X 02 = 20 Marks)
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(a) What is diffraction grating?
(b) What is a four-level lasing system?
(c) What are lattice parameters?
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(d) What is inverse piezoelectric effect?
(e) What are the applications of Heisenberg's uncertainty principle?
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(f) What are the limitations of free electron theory?
(g) What are indirect band gap superconductors?
(h) What is Bohr Magneton?
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(i) Define London penetration depth.
(j) What is quantum confinement?
PART - B
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(Answer all five units, 5 X 10 = 50 Marks)
UNIT - I
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2 (a) Explain how to find the wavelength of given light by forming Newton's rings.
(b) Calculate the thickness of a soap film (µ = 1.463) that will result in constructive interference in the
reflected light, if the film is illuminated normally with light whose wavelength in free space is 6000 A°.
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OR
3 (a) Discuss attenuation and losses in optical fibers.
(b) Calculate the refractive indices of the core and cladding material of a fibre from the following data:
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? = 0.22, ?µ = 0.012, where NA is numerical aperture.UNIT - II
4 (a) Explain the crystal structure of diamond.
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(b) Calculate the inter-planar spacing for (231) plane of an FCC structure whose atomic radius is
0.175nm.
OR
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5 (a) Explain how ultrasonics are produced by piezoelectric method.
(b) Write few applications of ultrasonics.
UNIT - III
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6 (a) Derive Schrodinger's time independent wave equation.
(b) Evaluate the momentum and the energy of an electron confined in a box of length 1Aº for the ground
and first excited states. Find the corresponding wavelength.
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OR
7 (a) Derive an expression for electrical conductivity in metals.
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(b) Electrons in a metal have a Fermi velocity of 1x106 m/s. Calculate the Fermi energy for the electrons
in a metal.
Contd. in page 2
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Firstranker's choice
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Code: 13A56101
UNIT - IV
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8 (a) What are drift and diffusion currents? Obtain expression for drift current.
(b) Find the intrinsic resistivity of Ge at room temperature (300 K) if the carrier density is
2.15 × 10-13 /m³. Given that electron mobility is 3900 cm²/Vs and hole mobility is 1900 cm²/Vs.
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9 (a) State and explain hysteresis.
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(b) A magnetizing field of 600 Am¯¹ produces a magnetic flux of 2.4 × 10-5 Weber in an iron bar of
0.2 cm² cross-sectional area. Compute the permeability and susceptibility of the bar.
UNIT - V
10 (a) Explain BCS theory of super conductivity.
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(b) The critical temperature of a given superconducting sample is 1.19K with mass 26.91. Determine
the critical temperature when the isotope mass changes to 32.13.
OR
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11 (a) Explain synthesis of nanomaterials by any method.
(b) Write applications of nanomaterials.
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