Download JNTUA B.Tech 1-1 R19 2020 January 19A56101T Applied Physics Question Paper

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Code: 19A56101T

B.Tech I Year I Semester (R19) Regular Examinations January 2020

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APPLIED PHYSICS

(Common to EEE, ECE & EIE)

Time: 3 hours

Max. Marks: 70

PART - A

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(Compulsory Question)

1 Answer the following: (10 X 02 = 20 Marks)

1. Write the principle of superposition.
2. What is called grating element?
3. How do you define ferroelectricity in dielectrics?

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4. Write the mathematical relation between magnetic susceptibility and permeability.
5. What do you mean by an electromagnetic wave?
6. Explain the principle of an optical fibre.
7. Define Fermi energy.
8. What is the value of energy gap in semiconductors?

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9. Mention the properties of superconductors.
10. What is nanometer?

PART - B

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

UNIT - I

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2 (a) Explain Newton's rings experiment with a neat diagram and obtain the condition for dark and bright fringe diameters.

(b) Write any four important applications of polarization

OR

3 (a) Describe Fraunhofer diffraction due to double slit.

(b) In Newton's rings experiment, the diameters of the 4th and 25th rings are 0.3 cm and 0.8 cm, respectively. Find the wavelength of light. Given R = 100 cm.

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UNIT - II

4 (a) Obtain an expression for the internal field seen by an atom in an infinite array of atoms subjected to an external field.

(b) A magnetic material has a magnetization of 3300 A/m and flux density of 0.0044 Wb/m². Calculate the magnetizing force and the relative permeability of the material.

OR

5 (a) Discuss ferroelectricity in dielectric materials.

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(b) What are the differences between soft and hard magnetic materials?

UNIT - III

6 (a) State and prove Stokes theorem. Give its importance.

(b) Write brief note on fibre optic sensors.

OR

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7 (a) State Gauss's law for electric and magnetic fields.

(b) Explain in detail about refractive index profile of graded index optical fibre.

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Contd. in page 2

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Code: 19A56101T

UNIT - IV

8 (a) How do you distinguish between intrinsic and extrinsic semiconductors giving suitable examples?

(b) Explain the origin of energy bands in solids.

OR

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9 (a) Describe Hall effect in a semiconductor along with its applications.

(b) Write important applications of semiconductors.

UNIT - V

10 (a) Distinguish between type-1 and type-2 superconductors.

(b) Write the applications of nanomaterials in different fields.

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OR

11 (a) Write a short note on BCS theory.

(b) Describe the synthesis of nanomaterials by chemical vapour deposition technique.

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