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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.
What are enantiomers and diastereomers? Differentiate among chiral and achiral molecules. Give an state of Reimer-Tiemann reaction. How is Bakelite made and what is its majo
How S.E.P. explains stability of particular oxidation state of transition metals?
What is difference between aluminium and beryllium?
mechanism of picricacids
Which of the following principles/rules limits the maximum number of electrons in an orbital to two: (1) Aufbau principle (2) Pauli's exclusion principle (3) Hund's rule
How is 7.979 times 10 to the 4th in scientific notation for the ordinary notation: 7979?
Ammonia is oxidised with air to form nitric oxide in the first step to produce nitric acid. The reaction occurs in a well insulated continuous reactor based on the stoichiometry:
net ionic equation for the reaction between aqueous solutions of perchloric acid and rubidium hydroxide
what the uses of nitro compound in pharmacy
The total post harvest system of cereal processing is given in the following flow chart:
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