Bsc CSIT Semester 1 – Physics – Unit 5: Fundamentals of Solid State Physics (6 Hrs.)

Question 1

Discuss single crystal growth by discussing following techniques: $\quad$(a) Czochralski Method, $\quad$(b) Bridgman-Stoclebarger Method, $\quad$(c) Floating Zone Method and $\quad$(d) Vapor-P

Marks: 10

Year: 2081 Final TU

1. Introduction to Single Crystal Growth A single crystal is a solid in which atoms are arranged in a continuous and periodic lattice throughout the entire material without grain boundaries. Single

Question 2

The energy gaps of some alkali halides are KCl = 7.6 eV, KBr = 6.3 eV, KI = 5.6 eV. Which of these are transparent to visible light? At what wavelength does each become opaque?

Marks: 5

Year: 2081 Final TU

Given Data | Compound | Energy Gap (Eg) | |----------|----------------| | KCl | 7.6 eV | | KBr | 6.3 eV | | KI | 5.6 eV | - Visible light wavelength range: