Download JNTUA B.Tech 1-1 R13 2014 June Regular 13A56101 Engineering Physics Question Paper

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Code: 13A56101
B.Tech I Year (R13) Regular Examinations June/July 2014
ENGINEERING PHYSICS
(Common to all branches)
Time: 3 hours Max. Marks: 70
PART - A
(Compulsory Question)

*****
1 Answer the following: (10 X 02 = 20 Marks)
(a) Write the conditions for constructive and destructive interference in the reflected light.
(b) What are the different pumping methods in lasers?
(c) What is meant by attenuation in optical fibers?
(d) What is Frenkel defect?
(e) What is meant by non-destructive testing?
(f) What are matter waves?
(g) Write the relation between conductivity and mobility.
(h) What is Fermi level?
(i) What is Bohr magnetron?
(j) What is penetration depth?

PART - B
(Answer all five units, 5 X 10 = 50 Marks)

UNIT - I

2 (a) Explain Fraunhofer diffraction due to single slit.
(b) The light of wavelength 5500 A

falls normally on a slit of width 22?10

cm. Calculate the
angular position of the first two minima on either side of central maxima.
OR
3 (a) Explain the characteristics of lasers.
(b) Differentiate step index and graded index fibers.

UNIT - II

4 Show that FCC is more closely packed than BCC and SC.
OR
5 What are ultrasonics? With necessary circuit diagram, explain the production of ultrasonics
using piezoelectric effect.

UNIT - III

6 (a) Derive Schrodinger?s time independent wave equation.
(b) Explain the physical significance of ?.
OR
7 What are the salient features of classical free electron theory? Also mention its drawbacks.

UNIT - IV

8 (a) Derive Einstein?s relations in semiconductors.
(b) Explain the working of a p-n junction with energy band diagram.
OR
9 (a) State and explain hysteresis.
(b) The magnetic susceptibility of silicon is ?0.4?10

. Calculate the flux density and magnetic
moment per unit volume when magnetic field of intensity 5?10

A/m is applied.

UNIT - V

10 (a) State and explain Meissner effect.
(b) Explain type-I and type-II superconductors.
OR
11 (a) Explain the basic principles in nanomaterials.
(b) Write applications of carbon nano tubes.

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R13
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