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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.
When Solutions of ammonia and Iron (II) bromide are mixed, what is the net ionic equation?
(a) Discuss, with the aid of diagrams, and with suitable examples, the chemistry (including half-cell reactions), construction and principles of the following electrode types: (
Q. Extraction of Aluminium? Aluminium cannot be extirpated economically from the silicate minerals. Therefore bauxite is the most important ore for the extraction of alumimum,
discuss the principle of zeolite process with chemical equation
In this synthesis of indole the addition of keto thioether to choloroamine to give sulphonium ion. this reaction is carried out at low temperature . why?
Simultaneous determination of exact position and momentum of an electron is: (1) Possible (2) Impossible (3) Sometimes possible sometimes impossible (4) None of the ab
Explain the un-ionized form of vanillin It is the un-ionized form of vanillin that has the typical odor. In NaOH solution, the phenol group ofvanillin ionizes to its conjugate
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
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