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02000EE206052001

State properties and applications of any two inorganic insulators.
Obtain the expression for conductivity in intrinsic semiconductors.
PART C
Answer any two questions, each carries 10 marks
Define Townsend’s first and second ionisation coefficients.
Derive the Townsend’s criterion for spark
Write short notes on intrinsic breakdown in solid dielectrics.
Explain origin of permanent magnetic dipoles.
How magnetic materials are classified?Explain any four types of them with
example.
State Curie —Weiss Law
PART D
Answer any two questions, each carries 10 marks
Explain the concept of superconductivity. Also draw the magnetic field Vs
Temperature characteristics.
Describe the fundamental principle behind atomic absorption spectroscopy.
Why solar selective coatings are required? Give examples.
Explain the fundamentals of
(i) Photo thermal conversion
(11) Photo voltaic conversion
Describe electron microscopy with appropriate schematic diagram.

Explain photo electron spectroscopy.

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