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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.
bilogical importance of carbon coumpounds
A copper tube 1 inch in diameter and 2 feet long is filled with steel balls of 1 inch in diameter. The space between the balls is filled with water. The specific gravity of steel i
The radius of first Bohr's orbit for hydrogen is 0.53 Å. The radius of third Bohr's orbit would be: (1) 0.79 Å (2) 1.59 Å (3) 3.18 Å (4)4.77 Å
Yes....because at boyles law....ideal gas equation is used and z=1 for PV=nRT
why is filtration in soil and water a slow process and explain the colour change in the filtrate
details about electronegativity
laws of chemical combination
#sulphuric acid can be made with concentration of 99%.however for diferent industrial requirement ,62% h2so4 is used which has density of 1.55 g/ml.calculate the molarity,molality
IN AMMONIUM ION NITROGEN DOESNT HAVE VALENCE ELECTRONS IN ITS VALENCE ORBITAL.
0.205g of a metal on treatment with dilute acid gave 106.6ml of hydrogen collected over water at 755mm pressure and 17 degree Celsius. calculate the equivalent mass of the metal. (
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