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Code: 13A56101

B.Tech I Year (R13) Supplementary Examinations December 2019

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) What is diffraction grating?

(b) What is a four-level lasing system?

(c) What are lattice parameters?

(d) What is inverse piezoelectric effect?

(e) What are the applications of Heisenberg?s uncertainty principle?

(f) What are the limitations of free electron theory?

(g) What are indirect band gap superconductors?

(h) What is Bohr Magneton?

(i) Define London penetration depth.

(j) What is quantum confinement?

PART ? B

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

UNIT ? I

2 (a) Explain how to find the wavelength of given light by forming Newton?s rings.

(b) Calculate the thickness of a soap film (? = 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

0

.

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:

NA = 0.22, ??

r

= 0.012, where NA is numerical aperture,

UNIT ? II

4 (a) Explain the crystal structure of diamond.

(b) Calculate the inter-planar spacing for (231) plane of an FCC structure whose atomic radius is

0.175nm.

OR

5 (a) Explain how ultrasonics are produced by piezoelectric method.

(b) Write few applications of ultrasonics.

UNIT ? III

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 1A

0

for the ground

and first excited states. Find the corresponding wavelength.

OR

7 (a) Derive an expression for electrical conductivity in metals.

(b) Electrons in a metal have a Fermi velocity of 1x10

6

m/s. Calculate the Fermi energy for the electrons

in a metal.

Contd. in page 2

Page 1 of 2

R13

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Code: 13A56101

B.Tech I Year (R13) Supplementary Examinations December 2019

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) What is diffraction grating?

(b) What is a four-level lasing system?

(c) What are lattice parameters?

(d) What is inverse piezoelectric effect?

(e) What are the applications of Heisenberg?s uncertainty principle?

(f) What are the limitations of free electron theory?

(g) What are indirect band gap superconductors?

(h) What is Bohr Magneton?

(i) Define London penetration depth.

(j) What is quantum confinement?

PART ? B

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

UNIT ? I

2 (a) Explain how to find the wavelength of given light by forming Newton?s rings.

(b) Calculate the thickness of a soap film (? = 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

0

.

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:

NA = 0.22, ??

r

= 0.012, where NA is numerical aperture,

UNIT ? II

4 (a) Explain the crystal structure of diamond.

(b) Calculate the inter-planar spacing for (231) plane of an FCC structure whose atomic radius is

0.175nm.

OR

5 (a) Explain how ultrasonics are produced by piezoelectric method.

(b) Write few applications of ultrasonics.

UNIT ? III

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 1A

0

for the ground

and first excited states. Find the corresponding wavelength.

OR

7 (a) Derive an expression for electrical conductivity in metals.

(b) Electrons in a metal have a Fermi velocity of 1x10

6

m/s. Calculate the Fermi energy for the electrons

in a metal.

Contd. in page 2

Page 1 of 2

R13

Code: 13A56101

UNIT ? IV

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

? 1 3

/m

3

. Given that electron mobility is 3900 cm

2

/Vs and hole mobility is 1900 cm

2

/Vs.

OR

9 (a) State and explain hysteresis.

(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 cm

2

cross-sectional area. Compute the permeability and susceptibility of the bar.

UNIT ? V

10 (a) Explain BCS theory of super conductivity.

(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

11 (a) Explain synthesis of nanomaterials by any method.

(b) Write applications of nanomaterials.

*****

Page 2 of 2

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This post was last modified on 11 September 2020