B.Tech I Semester (R20) Regular Examinations

ENGINEERING PHYSICS

(Common to all Branches)

Time: 3 hours

Max. Marks: 70

Answer all five units

UNIT – I

1. a) What is interference? Deduce the conditions for constructive and destructive interference. [6M]
2. b) Explain the formation of Newton’s rings with necessary theory. [8M]

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3. a) Discuss Fraunhofer diffraction due to single slit and derive the conditions for principle maxima and minima. [7M]
4. b) Explain the resolving power of grating. [7M]

UNIT – II

1. a) Explain the construction and reconstruction of hologram with neat diagrams. [7M]
2. b) Deduce the relation between Einstein’s coefficients. [7M]

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OR

3. a) Explain the principle and working of optical fiber with neat diagrams. [7M]
4. b) Deduce an expression for acceptance angle and numerical aperture of an optical fiber. [7M]

UNIT – III

1. a) Derive Schrödinger’s time independent wave equation. [7M]
2. b) Explain the physical significance of wave function ψ. [7M]

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OR

3. a) Explain Bloch theorem. [7M]
4. b) Explain Kronig – Penny model. [7M]

UNIT – IV

1. a) Derive an expression for carrier concentration in intrinsic semiconductors. [7M]
2. b) Explain the Fermi level in intrinsic and extrinsic semiconductors. [7M]

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OR

3. a) Explain the formation of P-N junction diode and discuss its V-I characteristics. [7M]
4. b) Explain the working of solar cell with neat diagram. [7M]

UNIT – V

1. a) Explain the construction, properties and applications of Carbon Nano tubes. [7M]
2. b) Write notes on Ball milling technique. [7M]

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OR

3. a) Explain the different types of liquid crystals and their applications. [7M]
4. b) Write the applications of Nano materials in various fields. [7M]

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