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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.
The total magnetic quantum numbers for d-orbital is given by: (1) 2 (2) 0, ± 1, ± 2 (3) 0, 1, 2 (4) 5 ans: 5
Explain CMR spectrum 2,2-Dimethyl-1-propanamine (neopentylamine, (CH 3 ) 3 CCH 2 NH 2 ) has a maximum of three resonances in its CMR spectrum. 2-Methyl-2-butanamine, CH 3 CH 2
brief explanation of claudes method of liquefication of g gases
Microcosmic Salt Bead Test Microcosmic salt, Na(NH 4 )HPO 4 .4H 2 O is as well used to identify specific cations just as borax. While microcosmic salt is burned in a loop of pl
why dipole moment of CH3CL is more than CH3F
In chemistry, an ideal solution or ideal mixture is a solution with thermodynamic properties analogous to those of a mixture of ideal gases. The enthalpy of solution (or "enthalpy
Ask The frequency of one ... The frequency of one of the lines in Paschen series of hydrogen atom is2.340x10 11 Hz. The quantum number n 2 which produces this transition is: (1) 6
Alkali metals belong to S-block ? why?
The given amines are CH3NH2, (CH3)2NH,NH3,NH2Br. The amines list is from strongest base to weakest . (CH3)2NH CH3NH2.
Short note of synthesis of dry and bhc
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