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4. (a) Explain the concept of (i) intrinsic, (ii) n-type, and (iii) p-type semiconductors with the aid of bond diagrams and band diagrams.
(b) What is a hole? Using a mathematical derivation to show that the holes behave like positive charges.
(c) Explain with the aid of Fermi-Dirac distribution function that at 0° K, all the energy states in the valence band of silicon are filled and all the energy states in the conduction band are empty.
(d) Why it is necessary to use effective mass instead of real mass for electrons in the analysis of semiconductor materials and mention why different effective masses are to be used for different types of semiconductors,
(e) Explain (a) bonding orbital and (b) anti-bonding orbital.
THermodynamic free enrgy is the amount of work a thermodynamic system can perform. The concept is useful in the thermodynamics of chemical or thermal processes in engineering and
Physical Properties of Benzoic Acid (a) Benzoic Acid is a white crystalline solid. (b) Benzoic Acid has m.p. 394 K. (c) Benzoic Acid is sparingly soluble in cold water bu
classification of mixture according to particle size, uniform mixture, composed of solute and solvent
write a balanced equation for the reaction in which dinitrogen pentoxide reacts with water to produce nitric acid
Properties of ethyl alcohol Physical properties It is a colorless liquid with a characteristic alcoholic smell. Its boiling point is 351K It is neutral towards litmus
Objectives: After doing this exercise you will be able to: 1 . Fill-up a F-22 form or write an application for obtaining the license permit for alcohol, 2 . Give justifica
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what is degree of freedom?
Low-grade phosphate rock can be upgraded by flotation processing. In this process the low-grade rock is grounded into a powder and suspended as a water slurry. The addition of smal
Properties
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