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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.
Geiger Marsden experiment The Rutherford experiment (also known as the Gold foil experiment or the Geiger-Marsden experiment) was an experiment to probe the structure of the at
What does this mean? H+/H2O
Sodium alkyl sulphates - Oils and Fats These types of detergents are sodium salts of sulphuric acid esters of long chain aliphatic alcohols consisting of generally 10 to 15 car
consider the reaction: Mg(s) +2H _Mg(aq)+H2(g).Calculate the standard electrode potential.
Krypton ( 36 Kr) has the electronic configuration (18 Ar) 4s 2 , 3d 10 , 4p 6 . The 37 electron will go into which one of the following sub-levels: (1) 4f
theroy & oranic compound ans
boiler troubles
h2c2o4 + mno-4 - mno-4 +co2
copper reacts with oxygen to form two oxides es x and y on analysis 1.535 g of x yielded 1.365 g of copper and 1.450 g of y yielded 1.160 g of copper(1) determine the chemical for
Hexagonal Close Packed (HCP) Structure:- The cell of HCP system has 12 corner atoms, one at each corner of the hexagon with two base centered atoms, one at the top face of the
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