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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.
Carboxylic Acids Carboxylic acids are the elements comprising the carboxyl functional group The carboxyl set is made up of carbonyl (>C=O) and hydroxyl (-OH) group.
the simplest forms of physical quantities
Mutation: A mutation is a physical or chemical change which changes the sequence of bases in DNA molecule. Anything which causes mutation is known as mutagen. A mutation conseq
The electronic configuration of element with atomic number 24 is : (1) 1s 2 2s 2 2p 6 3s 2 3p 6 3d 4 4s 2 (2) 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 (3)
The spectrum of He is expected to be similar to: (1) H (2) Li + (3) Na (4) He + Ans: Li +
A one serving bag of Granny Goose Hawaiian Style Potato Chips has 70 Cal. Considering that all of the energy from eating these chips goes toward keeping your heart beating, how lon
17.4g CaCO3= mol O
Teflon - Halogen Derivatives 1. Teflon is plastic such as substance produced by the polymerisation of tetrafluoroethylene (CF 2 = CF 2 ). 2. Tetrafluoroethylene is made whi
Write essey on organic quantitative analysis
A carcinogen is any substance, radiation or radionuclidethat is an agent directly involved in causing cancer. This may be due to the ability to break the genome or to the disrupti
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