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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.
In the anaerobic fermentation of grain the yeast Saccharomyces cerevisiae digests glucose from plants to form the products ethanol and propenoic acid by the following overall react
A 64-g sample of germanium-66 is left undisturbed for 12.5 hours. At the end of that period, only 2.0 g remain. What is the half-life of this material? 4. With a half-life of 28.8
if one ton contains 2000 pounds and the coal is 2% by mass sulfur, what is the mass sulfur in one ton of coal? how many grams of sulfur is this? how many moles of sulfur is this?
what is the difference between molarity and normality
a fast simple test for honey adulterated with invert sugar
Classification of proteins - Conjugated proteins The molecules of conjugated proteins are made up of simple proteins and non protein material. The non-protein material is known
what is libermaan''s nitroso reaction .what is mechanism of this reaction
What is gattermann Koch reaction?
Explain about the Defect breakdown It is because of cracks and pores at the surface. Moisture from atmosphere can collect on the surface and result in breakdown. Glazing is
Which of following carbon has sp3 hybriziation for bond formation.??? Ch3,c2h6,(ch3)3cho
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